Based on an old Cornish legend, the Mouse hole Cat tells the story of Tom Bawcock through the eyes of his cat, Mowzer. One winter, the Great Storm-Cat comes snarling and leaping at the harbour walls so that no boat can go out to fish. When all the food in the village is gone, Tom decides he must brave the terrible weather. As Tom and Mowzer sail into the mountainous seas, Mowzer sings a lullaby to calm the Great Storm-Cat of the sea. Tom catches enough fish to feed the entire village.