Minnie and her rescue cat Eddie can often be found out and about in their bookmobile near Chilson, Michigan, delivering great reads to grateful patrons all over the county. But they always brake for trouble, and when Minnie sees a car speeding away down the road, and soon comes upon a dead bicyclist, she assumes she just missed seeing a hit-and-run.

Minnie is determined to discover who was behind the wheel, but it soon turns out that things are far more complicated than they seem and there's more to this case than meets the eye. Luckily, this librarian is ready to read the killer his rights.