Signing on ‘The Staircase’, the former ‘Game of Thrones’ actress is joining Colin Firth, Toni Collette, Juliette Binoche, Rosemarie DeWitt and Parker Posey in the cast ensemble.

AceShowbizSophie Turner has signed on for her first post-baby role after joining the star-studded cast of HBO Max’s limited drama series “The Staircase“.

The “Game of Thrones” star will play the adopted daughter of Colin Firth‘s character, real-life killer Michael Peterson.

Toni Collette, Juliette Binoche, Rosemarie DeWitt, and Parker Posey will also appear in the film, directed by Antonio Campos.

Collette will play Peterson’s wife, Kathleen, who died under suspicious circumstances, while DeWitt will portray the deceased’s sister, and Posey a top attorney.

Binoche’s character is being kept top secret, according to Deadline.

The film will be based on a documentary from director Jean-Xavier de Lestrade, which chronicled the story of a crime novelist accused of killing his wife after she was found dead at the bottom of a staircase in their home.

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