While the town buzzes about the "Compton Beast," a mysterious animal accused of attacking local livestock, young Sarah Parker worries that she will lose Digger, the newest, cutest puppy to arrive at King Street Kennels.
Neil decides to investigate when strange things begin to happen after a mysterious stranger shows up late one evening at King Street Kennels saying he was called out of town unexpectedly and needs the Parkers to care for his very well-trained dog, Jessie.
Amos the hippopotamus advertises for a bird to help him with his bug problem, but the tick bird who answers his ad creates a different set of problems for Amos by building a nest on his head.
With nowhere else to turn, a field mouse asks the clever escaped lab rats living under the rosebush to help save her son, who lies in the path of the farmer's tractor, too ill to be moved.
Presents the further adventures of a motorcycle-riding mouse who goes to school and becomes the instigator of an investigation of rodents and the peacemaker for two lonely boys.