Major Canines - The Thomas Hunter Files: Realm Travelers, #2

It's not only Tenebrosorum vamps that are after Hunter, or an assassin from another plane, but also San Francisco's ruling pack of werewolves. Why? Because they all think he knows the whereabout of the key. He doesn't even know what he had for lunch with all that amnesia caused by the body swapping. Add to that bouts of phantom pain, a keen taste for alcohol and a broken heart and he's going to have one hell of a time staving off the end of the world.