The Queen of Dreams (The Dashkova Memoirs Book 6)

Things should be getting easier for Katerina "Kat" Dashkova. The former princess of the Russian empire wields considerable sorcerous powers, has learned to control the unruly prophecies in her head, and is a member of the Transcendental Society—a group dedicated to protecting the ideals of the Enlightenment from the tyranny of the supernatural—under the leadership of a quasi-immortal Benjamin Franklin.
Except the god Veles has laid claim to her former homeland of Russia, and unless she can stop him, the world will be his next conquest.
To reach Veles, Kat and Ben must travel through the realm of dreams in Baba Yaga's hut—a transdimensional craft owned by a trio of dangerous witches. The hut will help them reach their destination, but it contains dangers of its own, things that even the hut's mistresses have forgotten. Things that only need a little magic—or the whiff of prophecy—to escape.