The Captive Nanny is a suspenseful thriller film that explores the dangers of obsessing over a past lover. Chloe is a young woman who has hit a rough patch in her life, struggling to make ends meet while attempting to adopt a child. When she lands a job as a live-in nanny for the Brown family, Chloe sees it as an opportunity to get back on her feet and work towards her dream of becoming a mother.
However, things quickly take a sinister turn when Chloe realizes that the Browns are extremely secretive and deeply mistrustful of outsiders. Emily, the mother of the family, explains that this is due to the fact that her ex-boyfriend Baz is a violent stalker who poses a threat to their safety. Chloe agrees to help them keep their son safe, but soon realizes that something more sinister is at play.
As she spends more time with the Browns, Chloe begins to notice odd inconsistencies in their behavior. Emily and Michael, the father of the family, seem to be hiding something, and their paranoia about being watched and followed only grows more intense. When Chloe is accused of being a spy for Baz, she is locked up and subjected to a brutal interrogation that forces her to confess to crimes she didn't commit.
As the truth behind the Browns' bizarre behavior slowly comes to light, Chloe realizes that they are not who they appear to be, and that her life may be in danger. She must put all her wits and resourcefulness to the test to escape their clutches and reveal the truth about their twisted motivations. In the end, it is a chilling reminder of how far someone will go for love and revenge.