Spider's Bite: An Elemental Assassin Book by Jennifer Estep
After Gin's family was murdered by a Fire elemental when she was thirteen, she lived on the streets and eventually became an assassin to survive. Now, Gin is assigned to rub out an Ashland businessman, but it turns out to be a trap. After Gin's handler is brutally murdered, she teams up with the sexy detective investigating the case to figure out who double-crossed her and why. Only one thing is for sure--Gin has no qualms about killing her way to the top of the conspiracy.