When Gwen discovers her dad has escaped from Snake Dungeon in Winter Hill, she and her pack race to the town, desperate to find out whether her mum is still being held there. But when they arrive they realise the Braxans are watching them, and when they split up, the dogs start disappearing. Gwen isn't sure who she and her pack can trust in Winter Hill. Will they find a way to Snake Dungeon – and if they do make it, who will be waiting for them?