Lionsgate is backing the project, which stars Sweeney plays Millie, a struggling young woman who is relieved to get a fresh start as a housemaid to Nina (Seyfried) and Andrew (Sklenar), an upscale, wealthy couple. But Millie soon learns family secrets far more dangerous than her own past.

EXCLUSIVE: Following the box office success of Sony’s It Ends With Us, Brandon Sklenar has found his next high-profile adaptation to star in. Sources tell Deadline that he is set to join Sydney Sweeney and Amanda Seyfried in the Lionsgate adaptation of The Housemaid.

Brandon Sklenar has locked down his next major project, and this time it's opposite Sydney Sweeney. Sklenar — who starred earlier this year as Atlas in "It Ends With Us" with Blake Lively — will star alongside Sweeney in an adaptation of "The Housemaid,

Brandon Sklenar is set to star alongside Sydney Sweeney and Amanda Seyfried in the upcoming psychological thriller ‘The Housemaid’, directed by Paul Feig. Sklenar, who recently appeared opposite Blake Lively in It Ends With Us,