Spring has arrived in Long Farnden and with it, a mysterious infestation. Lois Meade's daughter has found her village store overrun by insects and reptiles. As Lois looks into the invasion, her investigation leads her to Robert Pettison, a seemingly unhinged zookeeper, and his nephew. The two of them are knee-deep in illegal trade, and they don't take kindly to Lois poking her nose into their business.

Lois enlists the help of her faithful cleaner Dot Nimmo and police inspector Hunter Cowgill to discover more about Pettison and a suspicious death at the zoo. And death is in store for more people if Lois doesn't put the killer behind bars soon . . .