Return to the wonderful characters of beloved, bestselling, award-winning The Goldfish Boy, one of the most talked-about debut children's books of recent years.

Melody Bird has discovered an old abandoned house in the corner of the graveyard, and a mysterious boy hiding out there...

Hal tells her that he's a spy-in-training, using the house as a base for his undercover surveillance of a known local criminal.

Her friends Matthew and Jake don't believe that a teenager would be entrusted with this mission and turn the tables to spy on him, uncovering secrets and unravelling a mystery as they go.

• The sequel to huge bestseller The Goldfish Boy
• A clever, very moving mystery for young readers to help solve
• "One of our most inventive writers for children" The Times