Fortune’s Pawn by Rachel Bach
Mercenary Deviana Morris wants to join the Devastators, the King’s own guard on Paradox. To gain experience, she takes her high-tech suit of powered armor and applies for a position as security guard on the unlucky Terran trading ship Glorious Fool. Attracted by the handsome ship’s cook Rupert, she is stunned to meet the ship’s doctor, a potentially dangerous xith’cal. Fast-paced and entertaining, with a kick-ass heroine who’s curious, stubborn, loyal, and passionate, this book will appeal to fans of military science fiction or space opera. This is the first book in the Paradox trilogy, followed by Honor’s Knight. The Long Way to a Small, Angry Planet by Becky Chambers is a good readalike, along with books by Elizabeth Moon and David Weber.