William is a lonely young man on the loose in the late 1960s. A disastrous appearance as a stand-up comic in a pub called The Man In the Moon is only the start of his adventures, in which he consorts with theatrical types, frenzied advertising men and accident-prone lodgers.William’s exploits lead him eventually to the consulting rooms of a Harley Street psychiatrist, where his delusions that he is a comic genius can finally be laid bare.