Ilona Andrews

The Kate Daniels novels are set in a slightly futuristic Atlanta, where magic and tech periods follow one another. During tech, guns and cars work. During magic, planes fall from the sky and generally anything technological fails but forgotten magic spells work again. In this world, magical creatures again roam the lands. Heroine Kate Daniels is a mercenary who fights various types of monsters. Kate is special: she is a human with some magical abilities but foremost she's a great warrior.