Herman (Peter Noone) lives in Manchester, England, with a greyhound named Mrs. Brown. He's sure the dog is a surefire money-winner, and so the Hermits, his band, pack up and head for swinging London, with designs on making their fortune at a big greyhound race. Along the way, they meet hobos, millionaires and fashion models. They also end up in a punch-up and find work playing shows. But music is just something on the side, because Mrs. Brown is their ticket to the easy life.