Journey back to the Roaring Twenties in small-town America and join Doro Banyon, college librarian and armchair detective, as she confronts another mystery.

Spring is in the air, and Doro is looking forward to her hometown's May Day celebration. When her friend Aggie wins the baking contest, their celebration is short-lived because the two local lawmen-judges for the competition-fall ill after consuming extra portions of Aggie's jam roll. Rumors run rampant, especially when the town doctor pinpoints the cause as arsenic poisoning.

With the constabulary down for the count, the two friends must unravel the mystery. As they study possibilities, Doro and Aggie find plenty of dangling threads and likely suspects. Is someone trying to make Aggie look bad or get even with her? Or do area bootleggers want the police out of their way while a big load of illegal liquor is transported through the area? Doro resolves to crack the case before more trouble hits town.