The second half of season one is darker than the first half, but it seems deeper somehow, and it turns the viewer upside-down.
Hard to write a review without spoilers, but I'll do my best to not spoil this treat for anyone.
The last couple of episodes (especially) leave you almost gasping for breath. People you think might be dead or gone may not be dead or gone, people you thought you knew aren't who you thought, and some 1,000 watt lightbulbs go on over the head of the viewer. You may find yourself (at the end of the last episode) sitting with your mouth hanging open and then saying, "Ohhhhhh! NOW I get it!"
Great season-finisher, great cast, great characters (if not likeable, then certainly unforgettable).
If you enjoy sci fi soap operas, you'll love Caprica. It's not filled with fights and thrills like Battlestar Galactica, but Caprica will have you on the edge of your seat nonetheless, fingers digging into the arms of your chair.