Shy, virginal Stephen Patterson is suffering from writers block on his latest money-spinning bodice-ripper. His mood can only worsen when Dave the plumber shows up late, apparently mocks him, and eats his treats instead of working. However, first impressions can be deceptive. What Stephen hasn't foreseen is that Dave is a highly unusual tradesman with an odd line in biscuit-based philosophy, an endlessly open-minded approach to sex, and a cast-iron certificate in unblocking things. After a bit of bizarre banter and some actual work, Stephen's narrow life is about to get much more interesting.