When Emma Hill rents a quiet apartment overlooking a seemingly ordinary building, she hopes for a fresh start. But everything changes the night she witnesses a murder through the window across the street. The police dismiss her claims—no body, no suspect, no trace of the victim.

Haunted by her suspicions, she becomes obsessed with uncovering the truth. As her investigation deepens, strange things begin to happen: missing objects, mysterious messages, and visions more like memories than nightmares. Slowly, a more terrifying truth emerges—Emma isn't just a witness to the crime.

She committed it.

But Emma suffers from dissociative identity disorder, and the murder was carried out by a version of herself she doesn't remember—an alternate personality named Emily, created to protect her from the traumas of her past. As memories resurface and her fragmented mind begins to piece itself together, Emma must confront her dark side before it's too late.

A tense psychological thriller with a stunning ending, Behind Her Eyes explores the blurry lines between reality and illusion, guilt and survival, and what it really means to live with yourself.