On a seemingly perfect beach day, Alison and her younger brother, Kevin, narrowly escape a brutal shark attack thanks to the enigmatic and brooding Daniel. To Alison’s mother, Diana, Daniel is a savior, but to Alison’s boyfriend, Carson, he is a suspicious figure with inconsistent stories. Daniel quickly ingratiates himself with Diana, winning her affection and a place in their home, yet Alison becomes wary of his strange and overly protective demeanor. As her friends and family begin to disappear, Alison uncovers the truth about Daniel’s sinister past, marked by a trail of victims. Determined to make Alison his own, “Daniel” will stop at nothing, and Alison must act swiftly to protect Kevin and Diana from becoming his next targets.