As an aircraft mechanic, Sierra Bauer is a woman in a man's world. There are few things more satisfying to her than the challenge of working on multimillion-dollar turboprops at the Minneapolis-St. Paul Airport, especially now that her life has returned to normal after losing her brother in a plane crash, and almost losing her career in the FAA investigation that followed. Normal is pitched into a tailspin when she finds a frozen body in a plane she is inspecting. Detective Quinn Moore is certain Sierra's discovery is happenstance until he learns the victim, Tori Hjelle, is the woman Sierra blames for her brother's death. Despite his attraction to her, he must consider Sierra a prime suspect.