On a seemingly perfect beach day, Alison and her younger brother, Kevin, narrowly escape a brutal shark attack thanks to the intervention of the enigmatic and brooding Daniel. To Alison’s mother, Diana, Daniel is nothing short of a savior. However, Alison’s boyfriend, Carson, views Daniel as a potential threat, suspecting that his stories don’t quite add up. Daniel manages to win over Diana, gaining her trust and a place in their home, but Alison becomes wary of his strange and overly protective behavior. As her loved ones begin to disappear, Alison uncovers the truth about Daniel’s deceptive identity and his sinister past marked by a trail of victims. Determined to make Alison his own, “Daniel” will stop at nothing, and Alison must act quickly to protect Kevin and Diana from becoming his next targets.