According to Deadline, Game of Thrones’s Sophie Turner is just the latest star to join the streamer’s scripted TV adaptation, based on the 2004 documentary series of the same name from director Jean-Xavier de Lestrade about author Michael Peterson. Related

Colin Firth to Push Down HBO Max’s The Staircase Adaptation

The Staircase Is a Compelling Companion Piece to Making a Murderer

The Real Killer in The Staircase Might Be … an Owl? As previously announced, Colin Firth will play the alleged murderer, while Toni Collette will portray Kathleen Peterson. Photo: Mike Coppola/Getty Images for Turner

HBO Max is clearly gunning for your now-empty Mare of Easttown minutes with the cast of their upcoming docudrama, The Staircase. Intriguingly, Juliette Binoche has also joined the series in an as-yet-unspecified role, which Deadline says is “being kept under wraps.” We had the same idea you did, though: Who better to play the owl? In the eight-part limited series from The Sinner’s Antonio Campos and American Crime Story’s Maggie Cohn, Turner will play Margaret Ratliff, one of Peterson’s adopted daughters. The Staircase Director on the Peterson Case and the Owl Theory

Tags: Meanwhile, Parker Posey helps round out the cast as late assistant district attorney and prosecutor Freda Black, with Rosemarie DeWitt as Kathleen’s sister, Candace Zamperini. Peterson has been accused of killing his wife, Kathleen, in 2001, though he claimed to have found her at the bottom of a (you guessed it) staircase in their home.