I've just finished "The Atlantis World", the last in a trilogy (after "The Atlantis Gene" and "The Atlantis Plague") by A G Riddle (note the gag in the name and titles). The books certainly didn't play out as I expected them to (it starts with a Nazi submarine in an Antarctic iceberg and a murderous kidnapping of two autistic children) but the end result was quite pleasing. It starts off like an episode of 24 and ends up in a huge space opera. There are some poor elements and some of the huge plot points are kind of glossed over, others are introduced for no apparent reason (there is one section where the heroes are trapped in a kind of alien-prehistroic zoo that is just completely pointless) but overall I enjoyed it.