After her mother's sudden death, Karen finds herself back in her childhood home in Nova Scotia for the first time in a decade, acting as full-time caregiver to her older sister, Kelli. Overwhelmed and consumed by the isolation of her new role, Karen finds a shoulder to cry on in Trevor—one of Kelli's caregivers. Karen gratefully accepts his friendship and comes to trust him all the more when she discovers how close Trevor was to her mother, Irene. But all is not as it appears to be. What begins with friendly advice and someone to talk to soon takes a dark and mysterious turn. Who is this person Karen has let into her home and into her family's life? How well does she know the stranger she has entrusted with her sister's well-being? As Trevor slowly weaves himself into Karen and Kelli's lives, Karen starts to grasp the unsettling truth about him and his relationship with her mother—and to experience for herself the true and dangerous nature of Trevor's "care."