A grieving psychiatrist, played by Casey Affleck, makes a fateful decision to invite his patient's mysterious brother, portrayed by Sam Claflin, into his family's life following a devastating tragedy. Directed by Christine Jeffs, this tense psychological thriller explores the dangerous blurring of professional boundaries as the charismatic and unsettling newcomer ingratiates himself with the therapist's vulnerable wife, Michelle Monaghan, and troubled daughter, India Eisley. What begins as an act of compassion soon spirals into a chilling game of manipulation and obsession, shrouding their secluded home in an atmosphere of paranoia. As hidden motives surface and trust erodes, the family must confront the terrifying reality that their attempt to heal may have invited a predator into their most private spaces.