Collider – June 1, 2021 at 02:05PM:
The Staircase tells the story of American novelist Michael Peterson (Firth), his sprawling North Carolina family, and the suspicious death of his wife, Kathleen Peterson, a corporate executive and mother/stepmother of five.
Toni Collette will play Kathleen Peterson, and the series will co-star Juliette Binoche, Rosemarie DeWitt and Parker Posey, the latter of whom will play prosecutor Freda Black. Turner will play Margaret Ratliff, one of Michael Peterson’s adopted daughters.
Game of Thrones star Sophie Turner will play one of Colin Firth’s daughters in this new true-crime series from HBO.