The first trailer for Other Mommy has arrived, and it looks like director Rob Savage is diving headfirst into one seriously unsettling story. Based on Josh Malerman's bestselling novel Incidents Around the House, Other Mommy looks like the kind of horror movie that'll have people checking dark corners of their homes long after the credits roll. Jessica Chastain takes on dual roles as Bela's real mother and the sinister "Other Mommy," the supernatural manifestation haunting the family. That's the kind of horror concept that sticks with you because it preys on trust, family, and the safety of home. Between Savage's knack for suspense and Chastain's creepy dual performance, Other Mommy has all the ingredients to become one of the year's most talked-about horror films.