Surgeon and world-walker Ryn Wilkie faces her toughest trials yet—across multiple worlds and in matters of the heart. Jack Varga, hiding secrets of his own, wants more than friendship, but how can he measure up to a woman who leaps between parallel Earths? As Ryn tackles her surgical fellowship on Earth, and pushes to elevate the people of Cearth, the steam-powered parallel world that’s stuck in the late 1800s, her efforts to raise everyone’s standard of living might unlock greater freedoms for women. When her brother mishandles some gold she gave him, putting a ruthless gang on her trail, danger spills across all three worlds—including the one empty of humans but rich with species extinct on her home planet. It seems as if everyone Ryn loves is in danger. Travel with Ryn to worlds full of terror and promise. “Some of the best Sci-Fi I’ve read in years.” “…reminds me of Heinlein and Asimov…”