Road Kill: A Dan Shamble Adventure by Kevin J. Anderson is currently free to download from Amazon (US, ES). This is the book synopsis:
Road Kill: A Dan Shamble Adventure
With Introduction by Kevin J. Anderson
When Dan Shamble, Zombie PI wakes up in a coffin in the back of a semi truck, he knows it's not going to be a good day. He has to escape, figure out what's going on, foil a black-market blood-smuggling ring—and make sure he's not dead on arrival!