Karen is a successful ER doctor who has recently broken up with her long-term boyfriend and is still trying to move on. One night, while walking home from work, she is attacked by a stranger and almost killed. She is saved by Daniel, a Good Samaritan who happens to be passing by. Daniel is badly wounded in the process, and Karen takes him home with her so she can care for him.
As Karen spends more time with Daniel, she begins to notice that there is something off about him. He is quiet and brooding, and seems to be hiding something from her. She also starts to have strange, vivid dreams about her past that are linked to Daniel in some way.
As Karen tries to unravel the mystery of who Daniel is and what his intentions are, she begins to uncover some shocking truths about her own past. She realizes that Daniel has a sinister connection to her past, and that he may not be the hero he seems to be. Karen must now find a way to protect herself from Daniel and exorcise the demons of her past before it's too late.
As the movie progresses, we see Karen becoming increasingly paranoid and paranoid as she tries to uncover the truth about Daniel. She begins to see him as a threat, and fears that he may be planning to hurt her. Despite her fears, Karen is determined to get to the bottom of things and put an end to Daniel's sinister plans. The movie builds to an intense and dramatic climax, where Karen finally confronts Daniel and discovers the horrifying truth about his connection to her past.