Minnie Hamilton and her rescue cat, Eddie, cruise around lovely Chilson, Michigan delivering happiness and good reads in their bookmobile. But the bookmobile's future could be uncertain when a new library board chair arrives and doesn't seem too friendly to her pet project. Still, Minnie has to put her personal worries aside when a favourite customer doesn't turn up to collect her books. Minnie, at Eddie's prodding, checks on the woman and finds her lying dead in her snow-covered driveway. Now it's up to Minnie and her friends - feline and otherwise - to find the perpetrator and give them their due.