Detective Sonia Maza is investigating what appears to be a series of cartel-related murders. But as the corpses keep piling up in bizarrely gruesome and intimate ways, Maza soon realizes this is the work of a serial killer-with deeply personal motives. And more dangerously, a vigilante who has mastered hiding in plain sight, taking on the identities of those we most often overlook in society in order to achieve brutal-and permanent "justice." Detective Maza pursues the killer at the expense of her own personal life and finds herself on a gruesome journey that will ultimately lead her to question her own feelings about justice and what it means to be "good" or "evil."