Cole (Judah Lewis) is a very cowardly boy who is bullied at school and does not get the attention of his parents when he returns home. Only the nanny Bi (Samara Weaving) who often comes to take care of him on weekdays is the person he trusts and is closest to. There is a deep and sympathetic friendship between the two. Cole was very curious about what Bi would do after he fell asleep, so he sneaked out of bed one night and hid in the dark. What shocked Cole was that Bi brought a group of men and women to his living room and played the game of truth or dare. As time went on, this frivolous and hot game began to slowly change. The sudden bloody massacre made Cole understand that this was not a game, and Bi was by no means as simple as it seemed.