The Man Who Went Up in Smoke (A Martin Beck Novel) by Maj Sjöwall,Per Wahlöö

'The Man Who Went Up in Smoke' starts as Martin Beck has just begun his holiday: an August spent with his family on a small island off the coast of Sweden. But when a neighbour gets a phone call, Beck finds himself packed off to Budapest, where a boorish journalist has vanished without a trace. Instead of passing leisurely sun-filled days with his children, Beck must troll about in the Eastern Europe underworld for a man nobody knows, with the aid of the coolly efficient local police, who do business while soaking at the public baths - and at the risk of vanishing along with his quarry.