When her free-spirited sister Nina disappears into the enigmatic grasp of a self-improvement cult, skeptical and fiercely protective Anna decides to infiltrate their exclusive annual retreat. Posing as a devoted recruit, she discovers a chilling world of mind control, dangerous rituals, and a charismatic yet sinister cult leader with a deadly agenda. As Anna unravels the cult's secrets, she realizes saving Nina could mean sacrificing her own sanity—or even her life.