After a Black Friday riot ends in tragedy, a mysterious Thanksgiving-inspired killer terrorizes Plymouth, Massachusetts - the birthplace of the holiday. Picking off residents one by one, what begins as random revenge killings are soon revealed to be part of a larger, sinister holiday plan.

Inspired by Canuck WWI flying ace Billy Bishop, two young soldiers crash the front lines in August 1918. With the Allies detained, their platoon must desperately hold out alongside legendary Anishinaabe sniper Francis "Peggy" Pegahmagabow.

A big-city sommelier, Camila returns to her hometown and family-run business for the annual ice wine harvest that coincides with the holidays. But the visit is upended when the owner of the vineyard—her beloved godfather—announces they’ve hired a consultant named Declan Monroe to oversee the switch from old world methods to modern technology.

The key to solving the toughest homicides lies somewhere in the final hours of a victim's life. In each one-hour episode, determined investigators must piece together events during this critical window to reconstruct the timeline, unlock the motive, and ultimately close in on the killer.