In a house on Gloam island, there is a rot growing, there is a monster feeding and a girl fighting. Thirteen-year-old Gwen doesn't want to admit anything is wrong. Nor that everything feels different after her mum's passing – especially now it’s just her, her three younger siblings and their kind yet hopeless stepdad, Henry. When the family relocate to the remote island of Gloam to take over their grandmother’s house, Gwen believes things can’t get any worse. Until Esme Laverne arrives. Despite her perfect appearance, Gwen can’t shake the feeling there is something seriously wrong with their new childminder. As horrors unfold, Gwen must face everything she’s been running from to defeat the monster infesting her home…