The Penny Dreadful alum has landed a lead role on Spectrum/Paramount Network's Paradise Lost.
The new series will air on Spectrum before getting a linear run on Paramount Network.
Hartnett is attached as the male lead, with Bridget Regan (Jane the Virgin) cast as Frances, the female lead.
Barbara Hershey (Once Upon a Time), Nick Nolte, Gail Bean (Snowfall), Danielle Deadwyler (Gifted) and Shane McRae (Sneaky Pete) also join the cast of the 10-episode series.
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The series is about a psychiatrist who moves with her family from California to her husband's hometown in Mississippi only to uncover shameful secrets that irrevocably change the lives of everyone involved.
The story was created and written by Rodes Fishburne (Blood & Oil) who will co-showrun and Executive Produce.
Arika Lisanne Mittman (Dexter) also serves as writer and co-showrunner, and