Hallow Point: A Mick Oberon Job Book 2 by Ari Marmell
Mick Oberon may look like just another 1930s private detective, but beneath the fedora and the overcoat, he's got pointy ears and he's packing a wand. The Spear of Lugh is in Chicago. And everyone, everyone wants it, for it is said that he who carries the spear into battle cannot be defeated. Those chasing it include an agent of the infamous Wild Hunt; a mobster who knows far more about these things than he should; and of course both the Seelie and Unseelie Courts-the very last people PI Mick Oberon would want getting hold of the spear...