An elderly sex-pest is at large in DI Purbright’s home town.
Leaping out from behind bushes at unsuspecting females, making lewd suggestions and, when challenged, scuttling away with odd off-balance leaps, he soon earns the nickname of the ‘Flaxborough crab’. No one can identify him, and it turns out that quite a few older gentlemen have begun exhibiting over-familiar behavior around the opposite sex.
Suave Dr Meadow knows more than he is letting on, yet how can Purbright, aided once again by the fragrant but dodgy Miss Lucy Teatime, get him to talk? Events take a darker turn before the ill-assorted pair succeed in catching their crab.