Anachronauts: Stars Fall by Stefan Gagne

A hard-won peace has settled across the world, as Emily Moonthistle and her compatriots work to establish ties to neighbors. But old rivals emerge again, with their own ideas about neighborly ties -- specifically, tying the world down to their yoke. All must stand together in face of this threat while avoiding the prophecied doom of the world, when the stars fall...

Includes a special retail only bonus chapter, completing the side story from previous books.