"She's one mean mother." Paula Luna is a typical single parent trying to earn an honest living in San Uvalde. Alluring and edgy, she works her way through her workday amid a sea of incompetent coworkers and lascivious men. But Paula has an alter ego. As a member of a secret U.S. agency, Paula dons her uniform, knives, and a state of the art helmet that assists with her missions (and social networking) and becomes La Lechusa, a master assassin named after a creature of Mexican folklore. When one of her jobs leads to a power play for security contracts among competing corporations at Rexault Pharmaceuticals, La Lechusa is forced to take sides by her shadowy handlers. All the while, Paula has to deal with a mysterious power in two sacred necklaces bestowed by an eccentric neighbor for Paula and her daughter. The necklaces promise protection from impending doom by an "angel negra," black angel. Can Paula Luna maintain a normal life raising a daughter, looking for love, and partying with friends? Will the mystical force help or hinder her clandestine endeavors? Or will the blood on the blades of La Lechusa spell the end for Paula and her family?