 Richard enlists Julie's help in trying to recover his memory of the peculiar goings-on of which he has no recollection.He soon becomes aware that he is being trailed by a group of mysterious men.Meanwhile, in his confused mental state he is constantly tantalised by seemingly random and trivial things – a snatch of a popular song or a conversational nuance – which seem to strike a chord with him, for reasons for which he cannot account.