Gray Tidings by Hailey Edwards

Corpses are vanishing from New Orleans morgues, there’s talk of a sea monster in Lake Pontchartrain, and Hiram Nádasdy is turning the French Quarter upside down in search of a witch with the power to bring the dead back to life.
When the director assigns Rue the case, she suspects he’s sending her hunting all right. For her father, not the creature. Too bad she’s got her hands full with dueling covens, drunk revelers, and a whole lot of pool noodles. Oh. And it’s Mardi Gras. Of course it is. But as the locals say, laissez les bons temps rouler.