A Jewish Londoner embarks on a journey to find himself after learning some shocking news about his past in this eccentric British comedy. As the film begins, Leon is already in a time of transition, having quit his job for moral reasons and assumed a position in his mother's catering firm. His life is thrown into even more disarray when a bizarre coincidence reveals the truth behind his birth: not only was his birth the result of artificial insemination, but a lab mix-up means that his real, biological father is a complete stranger. The confused Leon sets out to find his "real" dad, and unexpectedly discovers that he is descended from a family of Yorkshire pig farmers.