Broken Roads — Carrie Vaughn

Cormac, a former bounty hunter of supernatural creatures, and Amelia, the essence of a Victorian wizard who survived her own execution and now shares his body, have settled down to a quiet life in the country. Or so they think. On a proverbial dark and stormy night, a visitor in trouble lands on their doorstep: Odysseus Grant, a magician with secrets. A dangerous demon has escaped his control, and he needs their help capturing it. Reluctantly, Cormac and Amelia agree -- And get thrown across space, time, and alternate dimensions, on a journey far outside their wheelhouse and abilities, full of weird magic, strange creatures, and even some old friends. All they can do is work together and hope they make their way home, sooner rather than later.