Boy Nobody (Boy Nobody, #1) by Allen Zadoff. Found in face-out fiction under Z. Boy Nobody is the perennial new kid in school, the one few notice and nobody thinks much about. He shows up in a new high school in a new town under a new name, makes a few friends, and doesn't stay long. Just long enough for someone in his new friend's family to die -- of "natural causes." Mission accomplished.
The Enemy (The Enemy, #1) by Charlie Higson. Shelved spine out under H. In the wake of a devastating disease, everyone sixteen and older is either dead or a decomposing, brainless creature with a ravenous appetite for flesh. Teens have barricaded themselves in buildings throughout London and venture outside only when they need to scavenge for food. The group of kids living a Waitrose supermarket is beginning to run out of options.