Edge of Mercy - The Mercy Series, #1

Charlie hides her true identity inside a community made up only of males, but her presence places everyone around her in danger. This community is surrounded by Draghoul, once-human creatures bent on infecting others. Left with no choice but to remain, she fears her secret will be discovered, and she'll be thrown to the creatures she dreads. Yet, the longer she stays with these survivors, the less benevolent they appear. In this new and dangerous version of the world, where the friend beside you might be an enemy and an enemy might be your only friend, seventeen-year-old Charlie protects her baby sister and herself from grotesque monsters outside the community as well as human ones inside.
Will the truth she discovers about her protectors save her or ultimately doom her to a fate worse than death? This is the first full-length novel in the Mercy Series.