Ashe Abrams has never slept a day in her life, and when a strange man named Deacon appears in her life she might just find out why. Ashe passes the time working at a local coffee shop and trying not to flunk out of college, while at night a war is raging on the streets of Vesper between two clans of monstrous beings known as Leeches. Whether she likes it or not, their war is about to become hers.