Prisilla lives in an alley behind a restaurant. Her best friend, Rosy, lives across the gutter near an ice cream store. After a busy week of stealing food scraps and scaring people, the two rodent pals decide to take Monday off together. Then Prisilla is invited out on a boat trip Monday. What else can a rat do but accept? She can call up Rosy and tell a little fib. So why does Priscilla feel so ratty?