Death Note 1 - The first half of the manga. Ends with Light wining, LADIES, etc. etc.
Death Note 2: Death Noter - The second half of the manga. DADDIES, MELLODIES, etc. etc. Oh, and Light also dies.
Death Note 3: Death Note with a Vengeance - Light returns from death as a super-powered shinigami attempting to plunge the world into a thousand years of generic darkness and rehashed unending night. Lots of cgi-heavy action sequences and wirefu where Light fights Near, who somehow now has Matrix-like wirefu powers of his own. Ends with Near dying and Light becoming the god of the the world -- BUT BECAUSE THAT ENDING DIDN'T SIT WELL WITH THE FOCUS GROUPS Light is defeated by Near and the world is saved with just enough resolution to be satisfying, but just enough ambiguity to leave room open for another sequel.