The episode begins with agents MacLaren and Forbes watching through binoculars and a camera, as three men wait to make a shady deal. When the salesmen they're buying from show up, the deal does not go smoothly. After a backpack filled with money is handed over, shots are fired, bodies are hit by cars, and people are left dead.
The three buyers manage to flee and avoid MacLaren and Forbes, but one of the Russians is left wounded on the ground. When MacLaren approaches him, he is shocked to hear a message from the director come from the mouth of the dying man. Apparently, support is required for a fellow traveler and specific directions need to be followed. MacLaren executes an escape plan by lying (again) to Forbes. He vows to chase after the crooks who got away while responsible Forbes stays behind and calls for backup. MacLaren gets in his car, rings Philip and Marcy and requests that they join him on the urgent mission. MacLaren needs Philip to find the location using the messenger's coordinates and he needs Marcy to meet him at the location with her medical kit. Unfortunately, Philip is still recovering from his own gunshot wound so he can't participate but Marcy picks up Carly and her large collection of weapons on the way.
MacLaren is shocked for a second time when he arrives at the location to discover that the traveler he needs to assist is one of the men from the crime scene. He explains who he is but they are reluctant to believe him. They wonder how an adult could survive receiving a message from the director without it killing him. MacLaren explains that it did kill him but he was already dying. Eventually they back down since their injured colleague Luca is minutes from perishing and they don't have a medic anymore, so they could benefit from Marcy's skills. When MacLaren asks what happened with their deal, Mr. Hall, the leader of this traveler squad, gives a synopsis. They were on a mission to acquire a component from Russian travelers and deliver it to another team for testing. The Russian team's historian was dead so they were out of cash and Hall's boys had to finance them in exchange for the handoff. But, those Russians got greedy and went rogue. They wanted to keep the money and the component so they could sell it. In the process they seriously damaged the component.
MacLaren is shocked again when he learns that traveler teams can and will turn on each other. Carter, the final member of Hall’s crew, scoffs that he must be new. After Mr. Hall and MacLaren share in a quick petty argument about how badly the component was damaged and how unreliable that plan was, Marcy and Carly arrive with the medical supplies. Marcy can't save the life of hemorrhaging Luca or internally bleeding Carter, who we discover has fatal health issues as well. Marcy wants to take both of them to the hospital but Mr. Hall is not having any of it.
Marcy takes a closer look at her patient. MacLaren takes a call from Forbes who informs him that they've got three dead bodies back at the scene. MacLaren lies to his partner (again) about not knowing the whereabouts of the car he was pursuing. Marcy can't locate the bullet inside Luca and she promises Hall that if she operates she will kill him. Her plan is to sacrifice Carter, who will not survive the night, and use his blood to save Luca’s life. Mr. Hall makes the decision as the leader of his unit and they sacrifice one to save the other. MacLaren heads out to throw Forbes off their scent as Marcy operates through the night.
Meanwhile, Trevor is having a totally different kind of day. He's enjoying his young body with a joyful morning run at school with his friend. Trevor is super fast but his throwing arm is less impressive. And his aim isn’t the only thing that needs improvement. His teacher, Ms. Day, visits him on the track to reveal that Trevor's parents will be meeting with her to discuss his grades later that day and she’d like Trevor to join. Carly also has an unexpected family meeting when she returns home to pick up her baby and her abusive ex, Jeff, drops by. He tries to prevent her from driving off but a kick to his groin allows Carly to get by him. Before getting behind the wheel she reminds him that if he wants to see his kid he has to pay child support.
Jeff can’t comprehend how Carly has changed so drastically in a short period of time. Across town, Philip is praying for an equally drastic change in his life. As he sits in the hideout, going through withdrawal and healing his injury, he receives an unwelcome social call from his former lawyer who comes bearing percocets. As Philip swallows a handful of pills, the lawyer has a look at his wall of fatality predictions. Philip, who can barely move from his chair, does a poor job of shrugging it off, but his previous legal representation knows better. He sees dates for months from now and guesses that it's the gambling matrix. This, he thinks, is how Philip makes all of his sports prophecies. Wrong, but, his incorrect analysis of the calendar-to-come is enough to blackmail Philip into giving him more bets.
After Marcy finishes a night of surgical work, saving Luca as planned, she heads home and finds Carly's abusive ex, Jeff who is taking advantage of his uniform and status to get information from Marcy that he can link back to Carly. When she tries to dodge his question about her defeat of the four men in the library parking lot, Jeff uses another tactic. He asks why Marcy is living with her social worker, and does she know that if the social worker is found guilty of fraternizing with a client, especially one who has developmental issues, he could lose his job. Marcy doesn't take his bait though.
Marcy's patient, Luca, has opened up his stitches night terrors when he was deeply asleep and couldn't be woken. Marcy sews him back up as MacLaren attempts to concoct a distraction for Forbes who has traced Hall and Luca. He already has a warrant and is about to go there. Luckily, MacLaren is able to contact Marcy in time for Hall and Luca to disappear.
Trevor in a meeting at the school with his parents, wants to disappear as well. He manages to leave by promising to quit football and focus on the sciences. His father is completely taken by surprise and isn't able to stop him.
When MacLaren, Forbes and some other agents reach their destination, they slowly circle the building before entering. MacLaren sprints towards the entrance with a fake look of panic and worry. But when Forbes grabs hold of the doorknob and a rather large explosion goes off, almost killing several agents, MacLaren’s look of panic and worry is quite authentic. As Carly drives the getaway car with her baby on board, yelling at Hall for not warning MacLaren about the explosion. When MacLaren storms into the traveler’s hideout he isn't pleased either, but Hall stands by what he did, that he had to destroy their base of operations and everything inside it so the FBI couldn’t track them. MacLaren does not accept this response.
His anger only increases when Trevor says that fixing the component won't be easy but they can do it and Hall rudely replies "You damn well better." Carly has to intervene to settle the argument between the two leaders, Trevor and Phillip get to work on the fixing and MacLaren and Carly get some air together. Marcy shares a moment with Luca when she chats with him about his night terrors; something that her brother suffered with as well. This inspires her to ask a question of Hall. She discloses that when she was young there was an emergency evacuation in her shelter block and she was separated from her brother. She's wondering if Luca could be her biological brother.
Hall isn’t interested and reminds Marcy of Protocol 2 which states that the future should be left in the past. He launches into a speech about how to do this job and stay alive you need to be focused and says that their team is unfocused. He refers to them as a bunch of tourists and criticizes Trevor for being worried about his parents grounding him, Carly for bringing her infant on the mission, Philip for being a junkie, and MacLaren for not knowing which side he’s on. Hall thinks their priorities are out of whack and Carly thinks his attitude is out of whack. The two combative travelers have a tense stare down until Hall yields.
MacLaren's wife Kat drops by the FBI with Chinese food for her workaholic husband who's working late, she's understanding of his long hours at the office, but curious as to what's going on with their sex life. It's been an awfully long time and she fears that work isn't the only thing she's sharing MacLaren with. Philip is having relationship problems, with his lawyer, who has procured a safe house where Hall and Luca can hide out for a while but wants a big payout in return. He demands to get 8% commission, as well as the rent and some bets for tomorrow. Philip, annoyed, agrees to 10% commission and no bets.
Marcy continues trying to discover if Luca is her relative from the future, when the two of them take a walk around town to prevent his blood from clotting and she inquires about his host's family. Back at the hideout, Trevor succeeds in repairing the component and MacLaren informs Hall that they have a safehouse for him and it's time for the grump to go. Mr. Hall, as usual, thinks otherwise. He not only wants to stay, he wants to lead the combined team. The argument is put on hold when Forbes calls MacLaren to give his partner an update on what information he's confirmed. He ID'd all of the dead bodies and has a picture of Luca walking around town with an unidentified blonde lady (Marcy). MacLaren lies, saying he has on Hall, promptly hangs up the phone and returns to reiterating that it's time for Hall to go. This time, Hall doesn't just want to stay, he wants MacLaren to kill Forbes.
His argument is that Forbes is too good at his job and Hall thinks he’s jeopardizing the mission so the only solution is to take him out. He tries to intimidate Maclaren by boasting about his seniority and convinces him to do what needs to be done and deal with Forbes as he and Luca take care of the component drop off. None of the travelers is keen on the idea of murdering Forbes on Hall's say so, but MacLaren appears to accept it and tells Forbes to meet him at a particular address. Once there, Forbes takes the lead in exploring the area as MacLaren, gun in hand, walks behind him, Forbes sees a black rental car pull up and MacLaren yells out "FBI!". In the car Mr. Hall and Luca put up their hands and are arrested.
The drop off Hall's team were supposed to make is handled by Carly and Trevor, with Philip's help who contacts the traveler team they need to connect with and has them meet at a different address; once there, they hand over the repaired component. The travelers head home and MacLaren sends them an emotional message via their communicators. He reflects on having to turn on another traveller, he thanks them for sticking by him and says that they'll find out soon if they made the right decision and encourages them to get some rest. Marcy stares at a photo of her and David, Trevor reads a science textbook, Philip wipes away his death predictions from the door-window. And Carly kisses the shoulder of MacLaren who she is lying in bed with. She calms his nerves, telling him they did the right thing. MacLaren carries on kissing Carly rather than going back to his wife.