Sleuth in this apple-cheeked British mystery is nineteen-year-old Penny, whose snappy detection is always ahead of the local police -- and Clive, affianced to cousin Clare, who in turn is attracted to Michael, prime suspect in the murder of a neighbor Stuart. Penny not only tracks down a night-runner's lair in Stuart's sea island castle, but brings Clive to bay as her own. Tame but brisk enough for tea.