If anyone watches the TV show Torchwood, then I would recommend the books. The books are just as great as the show and gives you amazing descriptions and plots. In two days I read two of them. From the moment you start reading them, you are hooked. My personal favourite so far is Something in the Water.
Like the TV Show, there are new aliens and mystery in each book. While admittedly in a couple of the books it is predictable, there are also a couple of books in the series that keeps you wondering. But still brilliant reads!