Billy Fleet is a mouse, a reporter for a London newspaper. In this action-packed, unusual novel, he begins by rescuing Matilda mouse just as she is about to step in front of a bus, to find that she has been taking Dream Drops - drugged sweets. The rest of the story concerns Billy's search for the pushers and Mr. Big, and both humans and mice are involved in the adventures. There is plenty of emphasis on what drugs do to the young mice who take them, including one death. A truthful account of the effects of drugs, with mice as the protagonists.