Anouk, Ben and Cara dream of a fabulous treasure buried in the golden island across the harbour. A mysterious, grizzled old man offers them passage on his boat, but only if they can solve seven, vexing riddles. If they succeed, a strange - and magical - prize awaits them. Enchanting illustrations by Stephane Jorish illuminate this story by one of Britain’s best-loved children’s authors, known best for his work on the Arthur series (Orion).