Jader's Fog: A Red Sabre Novel. Red Sabre, #3

In the west of Athemisia lies the imposing Spine of the World Mountains. These formidable peaks form a natural division between the eastern lands of the Thyrian crown and the western Jader colonies. But those who inhabit those lofty climes are a mysterious and complex people rarely seen by rail mercenary eyes. Seeking to settle an unlikely score, Captain Felicity Metticia ascends the mighty Petlushkwohap mountain in search of her stolen cargo and a dangerous foe.
She unwittingly leads her crew into a tangled web of culture, diplomacy and deceit where tensions strain the magnificent walls of Lalouzhi. Old grudges threaten war and the crew find themselves serving as unwitting pawns between the nations of the mountains and the tribes of the plains. Thrust into a wholly unfamiliar world, Felicity must follow in the footsteps of an unlikely guide as she seeks to save not just her reputation but her crews' very lives.