When Flight 828 lands in New York, Michaela and Ben Stone and the other passengers learn that years have passed, but they haven't aged a day. They reunite with loved ones, piece together their old lives and deal with mysterious voices in their heads.

The passengers from Flight 828 find themselves under government scrutiny as they struggle to resume their lives. Michaela is forced to confront the fact that Jared is married to her once-best friend, while Ben tries to help a fellow passenger reconnect with his son. Cal is approached by an obsessive stranger, as Grace and Olive disagree on whether or not to reveal a devastating secret.

Ben and Michaela investigate a shocking murder in fear that it's connected to Flight 828. Meanwhile, Ben struggles to accept the life Grace led in his absence, while Olive and Cal realize that being twins after five and a half years apart is harder than they thought.

Michaela and Saanvi have a similar vision, but it takes them some trial, error and teamwork to heed the call; Jared takes the fall for Michaela's misstep at work; Ben comes face-to-face with the man who replaced him.

Ben forms an unlikely partnership with Vance in a high-stakes race to locate the missing passengers of Flight 828. Meanwhile, Michaela helps a suicidal passenger who believes he is the Angel of Death, and Cal goes back to school, navigating both his unwanted celebrity and his former friends, who are all now 16 years old.

When Ben and Michaela put everything on the line to save the other missing passengers, the mission goes horribly awry and not everyone makes it out alive. The devastating result pushes Ben and Grace to a traumatic brink, while pulling Michaela and Jared dangerously close together.

Michaela uses her skills as a detective to find out more about Zeke, a hiker who disappeared in 2017 and may be one of them. Ben's family is impacted as public disdain for the passengers of Flight 828 rises.

When Saanvi goes missing, Ben suspects a fanatical group who have become obsessed with the passengers from Flight 828. Michaela must face the consequences of her reunion with Jared. Zeke returns to New York and has an ominous calling.

Another non-passenger appears to have come back from the dead, and Ben, Michaela and Saanvi want to know why now and why him. This mystery-man is also having callings. Saanvi experiences PTSD.