A mouse from the streets and a church mouse try to help a priest and an organist save Christmas by composing a Christmas carol. A mouse from the streets and a church mouse try to help a priest and an organist save Christmas by composing a Christmas carol. A mouse from the streets and a church mouse try to help a priest and an organist save Christmas by composing a Christmas carol. A mouse from the streets and a church mouse try to help a priest and an organist save Christmas by composing a Christmas carol.