Los Angeles, April 14 -- Emmy-nominated actress Linda Cardellini has officially signed on to star opposite Bill Hader in "They Know", a horror feature that marks Hader's debut as a film director.

Currently in production in Los Angeles, the film is positioned as a psychologically charged horror drama. The film centers on a divorced dad (Hader) who grows suspicious that his ex-wife (Cardellini) is secretly dating a mysterious man who is having a strange influence on their children, reports DEADLINE.

MRC is the studio financing the project, which is based on a script from Hader, stemming from an original story he created with his Barry collaborator Duffy Boudreau. Bob Graf and Hader are set to produce under the latter's Hanarply banner, with...