England, 1643. Civil war rages. Royalist Corfe Castle is under attack. Verity, a vivid Puritan, resides with her vituperative cat as enemy-guests. They dispute with all the occupants, on virtue, monarchy, Salvation, the classics and the castle mice--but Verity falls into sin by losing her heart to the exasperating Peregrine--who is betrothed to another.