The Stone Family struggles to unlock their mysterious wave of frightening 828 callings, while the person who may be key to solving them is trapped behind bars. Meanwhile, a shocking and disturbing incident leads Grace to suspect a local mom is in danger.

Tensions flare as the passengers of Flight 828 finally come to understand the meaning of their increasingly terrifying callings. Afraid of losing his daughter to the Church of the Believers, Ben confronts Adrian. Zeke challenges Michaela's trust, and Saanvi seeks help from an old flame.

As Zeke's condition worsens and the clock ticks towards his Death Date, he must confront his past while Saanvi tries to secure him a future. A pair of connected callings lead Ben and TJ to a surprising loved one, and Michaela faces a moral dilemma when her own calling instructs her to let a criminal go free.