Who Rang The Church Bell?

Children's book, ages 3-8. Three church mice live on communion crumbs from Sunday to Thursday, and on snack crumbs from choir practice from Thursday to Sunday. They face a dilemma when the preacher, upset because of low attendance, locks up the church. They decide to ring the church bell at midnight. The villagers, mystified by the bell ringing, take it as a sign. They return to church, and the lives of the church mice are happily returned to how they were before.