The weather is turning cool and a mouse, who is looking for a place to spend the winter, makes his way into the synagogue. When the rabbi discovers him, they strike a bargain. Since the somewhat plump Rabbi Saltzman enjoys eating while he works, he often makes a mess with crumbs that rain all over his desk and onto the floor. If the mouse, who the rabbi names Mazel (luck), will keep his study tidy, he can stay. As the weeks and months go by, Rabbi Saltzman teaches Mazel about the Jewish holidays and the special food associated with each. Because they have become good friends, by spring both rabbi and mouse are sad to part. Then there's a great surprise ending! Book, CD dramatization and songs and recipes.