May 1912. After the previous year's deadly heatwave, it's been an uneventful spring in Littleton Cotterell. Though for Lady Hardcastle and her fiercely loyal lady's maid Flo, at least there are the provincial delights of the village's inaugural art exhibition--and bicycle race--to look forward to.

But at the exhibition opening, there's a panicked shout of 'Fire!' In the confusion, the main attraction--an extremely expensive book--is stolen from under everyone's nose, as is a valuable painting lent by Sir Hector Farley-Stroud. Then the race, which starts as a charming day out, ends in a shocking death. And to top it all off, the Farley-Strouds reveal they're in debt and might lose their house.

The sleuthing duo soon find themselves torn between a murder investigation, an art theft mystery, and trying to help their pals. All with a suspicious figure from Flo's past, a supercilious insurance investigator, and a pair of rather bizarre treasure hunters on the loose...