The third book in the Martha B. Rabbit series by Shirley Barber.
Martha B. Rabbit knows all about those wicked rats. A long time ago, they stole all the food she had stored for the cold winter months ahead, and left her with nothing but a jar of mustard! But little does she know they are up to mischief again, planning to steal all the delicious food she brings home from Mr. Gnome’s guesthouse . . .