Xombies — Walter Greatshell

WARNING: "This is the Emergency Broadcast Network. The epidemic known as Agent X has contaminated all but the most isolated pockets of the country. A state of martial law has been declared. Stay inside. Barricade all windows. Lock all doors. The infected are considered to be psychotic and extremely dangerous. Trust no one. This is not a test."

Agent X is unlike anything modern science has seen before -- a fast-spreading virus that turns the infected into raving maniacs on the hunt for earth's few remaining survivors...

One of those survivors is Lulu, a seventeen-year-old girl spared by a rare medical condition. Immune to Agent X, and witness to her own mother's bestial degeneration, Lulu is on the run for the frozen north, the last place on earth rumored to be safe. But what's awaiting her is as unexpected, and as frightening, as what's followed her there...