When some school strawberry plants are vandalised, a lost shoe buckle at the scene of the crime leads straight to the Naughtiest Girl. It is hers, but how did it get there - and why would anyone want to pin the blame on Elizabeth? The next night, as she's dropping off to sleep, someone shouts 'Fire!' - so Elizabeth jumps up and rings the fire bell. But there is no fire and now Elizabeth is being blamed for a catalogue of silly tricks. If she can't prove her innocence, she's in line to lose her hard-won part in the school play. So when the same happens the next night, Elizabeth is reluctant to report a fire - except this time, there really is one...