Rot & Ruin by Jonathan Maberry. So many of the zombie books are about the actual event. This book starts in the ruins, some 15 years after the event. Benny Imura is the main character as well as his brother Tom. Benny has grown up in the post-zombie world where Zombies and Zombie Hunters (like his brother) are playing cards and the slice of humanity of that we can see is huddled behind the fences. Only a few people, like his brother, go outside the fence into the Rot and Ruin.
But Benny faces the coming of age rite that once you hit 15 you have to find a job. And Benny is finding that he is either ill-suited for most the jobs or he sees no future in some of them (slinging dead zombies into the burn pit all day long? I can see why). So as a last resort he turns to his brother Tom. As with a lot of siblings, there is tension, and Benny blames his brother for his parents passing away, thinking him a coward compared to the more boisterous zombie hunters. Everything starts going wrong after he discovers the the ultra-rare trading card, "The Lost Girl," which serves as the focal point for the rest of the book.
As to the rest? Read it and find out. Jonathan Maberry is a top-notch storyteller who spins excellent action sequences and keeps the story moving along. So come along and enjoy the ride.