Apple has landed "Downton Abbey" star Michelle Dockery for its upcoming limited series "Defending Jacob."

The cast has grown with the additions of both Dockery and Jaeden Martell ("It"), Deadline reports. They'll play a mother and son, and their TV family will be rounded out by Chris Evans. The "Avengers: Endgame" actor was reported in September to be starring in and executive producing the miniseries.

"Defending Jacob" is created by Mark Bomback, who adapted it from the 2012 crime-drama novel by William Landay; he'll also serve as showrunner. The story centers on Andy Barber (Evans), a father dealing with a murder accusation against his son (Martell). Dockery is set to Laurie Barber, Andy's wife and Jacob's mother.

The actress is currently working on the "Downton Abbey" movie, which is due out on Sept. 20, 2019. She previously starred in the series from 2010 to 2015. Following its end, she went on to star in the series "Good Behavior" and "Godless" as well as the film "The Sense of an Ending."

"Defending Jacob" comes from Paramount Television and Anonymous Content. Evans is joined as an executive producer by director Morten Tyldum and Anonymous' Rosalie Swedlin and Adam Schulman.

[via: Deadline]