From book cover: 'Belinda!' Holly yelled. Echoes bounced back, but there was no reply. 'You don't think she's fallen?' 'No!' but Tracy didn't sound so confident. 'Belinda!' Holly cried again. 'Where are you?' There was no answer. A runaway boy plunges to his death in front of Holly, Tracy and Belinda - The Mystery Club. The three friends are horrified. Who was the boy? Has The Mystery Club witnessed an accident - or a murder...?