treasure hunt
Williams spent the next few weeks gradually slotting ideas together in his mind. If the book was going to be a puzzle, he decided, then there should be a real prize at the end of it - and that prize should be genuine buried treasure. He was determined not to produce the same disappointment he'd felt as a child, when the cereal packet's promise of “buried treasure” turned out to be something as mundane as a cheap transistor radio sent by post. “I thought it'd be nice to really, really, bury treasure,” he told Radio 4's Profile. “Actually put gold in the cold, wet earth.”