Jennifer Estep 
Poison Promise 

In book eleven of her New York Times bestselling Elemental Assassin series, author Jennifer Estep continues one of the best urban fantasy series going on the market (Fresh Fiction).Gin Blanco is hard-nosed, sexy, and lethal. Nicknamed The Spider, shes a stone elemental assassin who brings her unique mix of magic and tact to every assignment, no matter the target. Theres a new drug on the streets of Ashland, and its name Burn sums up the potent effect it has on its users. When one of her restaurant employees is threatened by dealers of the drug, Gin steps in to set things straight