Knock, knock, knock, one, two, three! Kitty come and play with me! . . . It was supposed to be one of those harmless sleepover games girls play, and yet the morning after, one of them was gone. Twenty-three years later, the four who remained have built their complicated lives, but they've not forgotten the missing, and the missing has not forgotten them. When their own children begin experiencing disturbances, four estranged friends must face the secrets they've kept, because anyone who plays dark games should be prepared to accept dark consequences.
After finally having a sleepover that got interrupted by them having to leave on a small plane to the mansion on the hill, disappearing to a overgrown garden and getting kidnapped by an evil organisation, everything gets a lot more complicated, especially when her mother appears at the door of the mansion with a decade long feud.