Orphaned as a child, Octavia Leander was doomed to grow up on the streets until Miss Percival saved her and taught her to become a medician. Gifted with incredible powers, the young healer is about to embark on her first mission, visiting suffering cities in the far reaches of the war-scarred realm. But the airship on which she is traveling is plagued by a series of strange and disturbing occurrences, including murder, and Octavia herself is threatened.

Suddenly, she is caught up in a flurry of intrigue: the dashingly attractive steward may be one of the infamous Clockwork Daggers—the Queen’s spies and assassins—and her cabin-mate harbors disturbing secrets. But the danger is only beginning, for Octavia discovers that the deadly conspiracy aboard the airship may reach the crown itself.