Ashes and arsenic

"Agent Cesar Hawke is in is element when he's investigating magical crime. And with his boss out of town, Cesar gets to pick whihc cases he works on ... Instead, he's going to find the witch who used magic to rob a bank ... But when he digs into the robbery, he finds much more than missing money. He also finds a deadly turf battle between two covens and a trail of bloody violence."--Back cover.