Downton Abbey alumna Michelle Dockery and It star Jaeden Martell are set as leads opposite Chris Evans in Defending Jacob, Apple’s limited drama series based on William Landay’s bestselling novel, from Paramount Television and Anonymous Content.

Created and written by Mark Bomback and directed by Morten Tyldum, the limited series is described as a a gripping, character-driven thriller based on Landay’s 2012 novel published by Random House. The book tells the story of a father, Andy Barber (Evans), dealing with the accusation that his son, Jacob (Martell), is a 14-year-old murderer.

Dockery will play Laurie Barber, the wife of Andy Barber (Evans) and mother of Jacob (Martell).

Bomback, who also will serve as showrunner, Evans and Tyldum executive produce with Rosalie Swedlin and Adam Shulman for Anonymous Content.

Dockery is known for her role as Lady Mary Crawley in Downton Abbey and is reprising the role in the Downton Abbey feature film, which is in production. She recently headlined the TNT drama series Good Behavior and also starred in the Netflix limited series Godless. Dockery is repped by WME, Anonymous Content UK’s Hamilton Hodell and attorney Tara Kole.

Martell is known for his starring roles in It and St. Vincent. He’ll next be seen in A24’s Lowtide. premiering next month at the Tribeca Film Festival. He also reprises his role as leader of the Losers Club in Warner Bros.’ It: Chapter 2, set for release in September. Other upcoming projects include Neon’s The Lodge opposite Riley Keogh, which premiered at Sundance; Lionsgate’s Knives Out; and playing the title role The True Adventures of Wolf Boy. He’s repped by CAA and Emily Cho Talent Management.