Russian witch Baba Yaga and M. C. Laveau, the capitalist heir of a voodoo empire, clash over a rare prize created by chaotic magic leaking from Alamo excavations. Hapless bystander Rachel is caught in the middle: something's gotta give. Book 1 of the Baba Yaga Chronicles
A. Lee Martinez, Divine Misfortune
Tom Holt, The Portable Door
Diana Wynne Jones, Archer's Goon