Feeder (Tagged Universe Book 1‪)‬

Quiet child, or the monsters will come.
No one really knew what brought about the Change, when the human population had been reduced by more than 20% in the span of a week. No one really knew who ruled the New World, only that an entity called the Commission had risen to place the survivors under surveillance.
Keep your head down, do your job, and the Commission will protect you.
If.
If you follow their laws.
If you do not protest.
If you do not tamper with your tag.
Tags separated the good from the bad. The healthy from the sick. Blue Tags were supposedly safe from harm. Red Tags, on the other hand, were marked as prey for the undead.
Because with the Change, the Vampires had risen.
Quiet child, or the monsters will come.
For May Pearce, it was too late.
The monster was already here.