I'm nearly finished with Left 4 Dead. At least I think I am. So far it is one of my shorter novels, on a par with Wings of the WASP. The ending (so far) leaves room for two parallel sequels. One is already in my head, the other a new line I wanted to start. The new line is YA along the lines of Hunger Games or Divergent. The other branch goes in a really different direction, one that may well offend some. That has rarely stopped me.