Years ago, a beast decimated the population of the Americas and the resulting carnage was enough to weaken the very barriers separating Earth from other, far more dangerous worlds--and the monsters that roam within them. As a paranormal marshal struggling with her own less-than-human identity, Max is responsible for hunting down the most dangerous of supernatural creatures, working side-by-side with government operatives who specialize in keeping the human population safe. One of those operatives happens to be a six-foot-five, bullheaded but charming ex-boyfriend who won't accept no for an answer--especially when it comes to Max.
After an abnormal energy spike indicates that a being of exponential power has migrated through a barrier, people across Max's territory suddenly began dying or disappearing. But when a particularly gruesome murder hits too close to home, Max is forced into the fight of her life.