A threat to the Stone family tests Michaela's commitment to play by the rules and forces Grace to make a difficult decision; Ben enlists the aid of an old rival to save an old friend; Olive helps a new friend solve a calling.
Michaela's premonition leads her to pursue a fugitive; Ben tries to gain the trust of an unlikely ally; Olive's relationship with Levi leads to a fascinating discovery; Jared and Drea uncover devastating secrets; Saanvi faces a dilemma.
Ben and Saanvi join forces with Vance in his newest venture to understand Flight 828; Michaela and Zeke adjust to their new home life together, but they pivot to aid a non-passenger with a looming death date of their own.
As Michaela and Zeke collide with Jace in a grueling match to survive, Ben races against the clock to save his family; when they all converge in an intense battle, the fallout reveals a massive new clue regarding the fate of the 828 passengers.
The duo suspects a murdered zoologist was killed because of his numerous affairs or his trailblazing research; Holmes finds himself the victim of identity theft after his medical records are stolen.