Who Is Tom Ditto?

Tom, I have not left you. But I am gone. Please carry on as normal. Love always, Hayley. Has Hayley gone or hasn't she? And what is he supposed to bloody do in the meantime? Trying to work out what's happening to his confusing life, Tom tries to track Hayley down. In doing so, he stumbles across an eccentric group of people with an irregular hobby. Next, he's being followed, but he's not sure by whom. And then he also almost loses his job at the radio station. Above all, Tom is trying to work out who everyone is. Because who is Hayley? Who is this new girl following him around the supermarket? And who, for that matter, is TOM DITTO?