This is a further excellent novel by Hannu Raittila, the author who previously wrote the brilliant Canal Grande: Roman. While Atlantis is not so funny (there are several laugh out loud moments regardless) it works quite well on many other levels - as a fairly in depth view of Finnish life post WW2 up to and including now, and as a great character play.
Just like in Canal Grande: Roman the story is narrated by several of the protagonists from their respective point of view and several of the events are therefore described more than once from various perspectives. It works very well and the repetition is not annoying or superfluous - different people generally not focusing on the same aspect of an event.
The plot revolves around a megalomaniacal businessman, who'd like to create an adventure park with a 'live' history of Finland being performed for the visitors, several of his helpers (willing or otherwise), a sociology researcher chronicling the life of post WW2 Finns from a sunken village, and the locals, some of which very much oppose both the research and the adventure park scheme. This being Finland, the opposition is deadly serious and very different from what one would imagine elsewhere.
The book this might be most similar to (that has been translated into English) is Paasilinna's The Howling Miller, sans some of the more magical elements typical of the latter.