Take Tom Holt, Douglas Adams, Jasper Fforde, Terry Pratchett, Tom Sharpe, throw them in a mixing bowl, add a large helping of Stephen King, followed by a dollop of Anne Rice at her Vampire writing best, stir in Anonymous, (the one who wrote The Book with No Name,) add a sprinkling of Bram Stoker, followed by a dash of Michel Faber, at his "Under the Skin" best. Mix well and you might end up with David Wong.
John Dies at the end is a book that is difficult to put down, with a first person narrator the story never loses pace for one minute. I certainly didn't anticipate some of the twists the tale takes,and suspect most readers wouldn't.
I'm not going to tell you about it, apart from the fact there are explosions, shootings, police chases, and "Scooby-Doo" type scenarios throughout the book. Inwardly you are yelling at them not to go into that room with no windows and only the one door, don't open that silvery container, but you know they will. And you know they will come through the experience wiser and maybe still alive.
If you like books that are a little off the wall, I would say read this.
The bumph says soon to be a major movie, I found a link to it, here
I can only presume that it will eventually be released over here.