With L.A. abandoned and the families aboard Abigail, everyone tries to adjust to their new environment out on the sea, but no one quite trusts Strand. As Nick has a hard time with his mother's death, Alicia manages to make radio contact with another soul taking refuge on the open waters.
Being tailed by whoever sunk the boat they found, Abigail parks along the coast. There, the group finds a family of survivalists who have secured themselves against the cataclysm. While they're friendly and allow them the safe port, small things paint something unsettling under the surface.
Abigail is dead in the water due to engine problems. While Travis fixes it, Madison confronts Stand about the destination he's been keeping secret. Meanwhile, the others go to the nearby shore to scavenge what they might need from the remains of a crashed plane.
When Abigail is boarded by a small band of dangerous people, Strand attempts to get away. Unbeknownst to the others, Nick has journeyed to the mainland on a mission for Strand that links to his past which will help them get into Mexico.
Held captive by Connor and his people, Alicia learns how to make herself useful while plotting an escape, as Travis learns how Abigail was found. Meanwhile, Madison is taking the ship to Connor with the intent of getting her family back.
The group finally arrives at their destination in Mexico, but the estate they're staying at does not give them the rest they've hoped. Daniel and Nick remain haunted by the dead while Chris's recent behaviour is worrying Madison. Meanwhile, Strand's reunion with Thomas is bittersweet.
Strand's decision has Celia threatening to kick the group out, a situation not made better by Daniel's behaviour. Nick remains their only hope as he becomes more engrossed in her beliefs. Meanwhile, Travis goes searching for Chris after he runs away.
Nick's search for answers leads him into a deadly dog-eat-dog landscape. A dark time from his past is uncovered.
Madison, Strand and others move forward after the compound falls; Nick is picked for a dangerous assignment.
Travis struggles to connect with Chris while searching for shelter. Meanwhile, Alicia meets a lonely woman with a bloody past.
Alicia and Madison try to bring two competing factions together; Nick uses skills from his past for his new role.
At the Colonia, Alejandro reveals his darker side; a hotel resident becomes unhappy and Madison springs into action.
Madison struggles to cope as a large number of refugees flood into the hotel, including someone familiar but unexpected.
Travis is thrown off by new refugees; Nick must decide if he's going to stay at the Colonia with Luciana or leave.
When Travis' rage causes unrest at the hotel, Madison has to choose whether or not she will stand by him; Nick becomes leader of the Colonia as Narcos close in.