Jonas wakes up one day in the city of Vienna to find he is the only person alive on the planet. There are no birds, no animals, no people, no rotting corpses, no signs of human or any other kind of habitation. He makes frantic calls to his girlfriend's mobile, to his family, to the authorities He makes international calls. He begins to leave messages everywhere he goes and creates a huge banner to hang from the tallest building in the city. He constantly travels the city's outskirts looking for signs of other people. But finally he has to accept that he is the last man alive, and it doesn't take long for his mind to begin to play tricks.
This book is as much a psychological character-study as it is a dystopian fantasy, with Jonas's dilemmas credibly and realistically worked through as he goes back through his past life to try to glean some understanding of the night-time paranoia that develops. I found myself flagging a bit in the middle section of the book as Jonas seemed to be floundering in nostalgia, visiting his childhood home, holiday cottage, etc., all the while carting dozens of movie cameras around to watch himself sleeping. I didn't really get what he was up to some of the time - and nor, I feel will any average reader. It's quite a stock scenario for science fiction, but here it is played with ultra-realism and in the end my brain gave up and went to sleep. Kafka it aint.