I wandered over to Tananarive Due's blog this week to see if she had any new posts. And I was rewarded with the news that the third novel about Dawit and Jessica will be out early in 2008. I'm a big fan of her work and it is on my list of must-haves. If it were available now, I'd be dropping big hints about it for Christmas.
The novel, Blood Colony, won't be out until June 2008. So it will be awhile before you can get your hands on it - still that's more than enough time to re-read her early novels in this story.