The satsuma complex by Bob Mortimer

Gary Thorn goes for a pint with a work acquaintance called Brendan. When Brendan leaves early, Gary meets a girl in the pub. He doesn't catch her name, but falls for her anyway. When she suddenly disappears without saying goodbye, all Gary has to remember her by is the book she was reading: 'The Satsuma Complex'. But when Brendan goes missing, Gary needs to track down the girl he now calls Satsuma to get some answers. And so begins Gary's quest, through the estates and pie shops of South London, to finally bring some love and excitement into his unremarkable life.