From book cover: Just as Holly was about to follow Miranda off the tube train she suddenly felt someone wrench the plastic bag out of her hand. 'The bag!' she gasped. 'Someone's stolen it!' A wall of people blocked the train doors and Holly had to wedge her way back into the carriage, but before Miranda could get a foothold, the doors hut and the train pulled off into the tunnel. Holly was on her own. A trip to London to stay with an old friend plunges The Mystery Club into a perplexing and frightening mystery, when a simple evening's baby-sitting turns dangerous.