As the third season of HBO’s True Detective continues to flesh out its cast, the show has moved to bring in two further new additions.

Courtesy of Deadline, Alias Grace’s Sarah Gadon and Code Black’s Emily Nelson have joined True Detective in recurring roles. All that’s known about said roles is that Gadon is playing a character called Elisa Montgomery, while Nelson is playing Margaret.

The early word on True Detective’s return reads:

Season 3 tells the story of a macabre crime in the heart of the Ozarks, and a mystery that deepens over decades and plays out in three separate time periods.

Already on board for this third season are Mahershala Ali, Stephen Dorff, Carmen Ejogo, Scoot McNairy, Mamie Gummer, Rhys Wakefield, Ray Fisher, Michael Greyeyes, and Jon Tenney.

Nic Pizzolatto is once again back as showrunner, and he’ll direct alongside Green Room’s Jeremy Saulnier.