Solving mysteries is a risky business. But no mystery is too big for Holly, Miranda and Peter . . .
Holly's desperate for a mystery to solve - and when she sees a ferrety-looking man throw his wallet from the bus,she knows she's found one!
Miranda and Peter aren't so sure. The wallet is empty when they go back to find it. Empty except for some sort of ticket - and there's nothing mysterious about that. Or is there . . . ?
