0Claudia doesn't remember what happened that night in the garden but her mother can recognise goblin goo when she sees it. Molly comes to look after Claudia and tells her a story set in Bluebell Wood about a young fairy named Bubbles who causes mischief by stealing a magical triangle. The triangle falls into the hands of Grim the goblin, who uses it to enable the spread of a deadly 'bog'.
Bubbles goes missing and Commander Jack Edward of Dragonfly Squadron goes looking for her. Meanwhile King Bell asks the queen of the mermaids for advice and instructs Lord Rupert and his knights and dragons, along with the royal archers, to begin their work. But things go horribly wrong and Dr Poppy is called for. It's quickly realised that their only hope is to find Grim.
Claudia and her friend, Alpesh, become part of the story.