Allan is a hundred years old today, but he doesn't want to stay around for his party in the home in which he is resident, so he climbs out of the window and escapes.
This is the start of Allan's journey (into perhaps a fourth age?), and he becomes involved with a variety of characters - some criminal, and some merely suspect - and is also involved in a several deaths along the way. All Allan really wants is somewhere to live, a bit of company and a plentiful supply of vodka, but he get a great deal more than he has bargained for as his adventures begin. The present-day narrative is interspersed with Allan's back story from his youth until the present, and he has led a very eventful life. His expertise in the field of explosives has led him round the world (sometimes accidentally), and he has come into contact with, among others, President Truman, Mao Tse Tung, and Stalin; all, again, accidentally. He has a charming, almost innocent approach to life, and is a most endearing character. While he has no interest whatsoever in politics, he somehow can't avoid becoming involved, and changes sides as fate dictates, with scant regard to his own safety.
This is a thoroughly enjoyable romp of a novel. What is particularly satisfying is that the humour (and at times, this novel is very funny indeed) translates beautfully from the Swedish, so full marks to the translator, who has done a wonderful job. My only (tiny) reservation would be that some of the descriptive passages are a little over-long, but I have no hesitation in recommending the book. I don't think anyone can fail to enjoy it.