Beth's life hasn't worked out the way she planned. After her father walked out on their family with a note simply saying 'I'm sorry', she became obsessed with finding him. An obsession that destroyed her relationship with her husband and her daughter. She just has her dying mother left, Beth taking care of her as best she can until she breathes her final, shocking words: Your father. He didn't disappear. Don't trust... Still processing these words, Beth receives a surprise call to say her sister has been attacked and rushed to hospital. Soon after, she finds both estranged sister and brother returning to the family home. She makes sure to lock her bedroom door at night. Her sister can't be trusted. Desperate to revisit happier memories, the siblings find themselves watching home videos of their childhood. It feels like a good idea, until the footage shows them their father covered in blood, their mother's voice panicked, and a dead girl's body. They'd love to believe it's fake, but they know the girl in the video.