In 1974, 11-year-olds Wendy Richards, Jude Cunningham, Kelly Lynch and Nick McBride play hide-and-seek in an abandoned convent. When 10-year-old Robin Hammond tries to join them, the group starts teasing her, repeating "Kill! Kill! Kill!", and leading to a scared Robin accidentally falling to her death through a second story window. The children make a pact not to tell anyone what happened and keep the incident a secret and they leave. Just then, the shadow of an unseen person who witnessed Robin's death crosses over her body.