The Spare Man

Hugo, Locus, and Nebula-Award winner Mary Robinette Kowal blends her no-nonsense approach to life in space with her talent for creating glittering high-society in this stylish SF mystery, The Spare Man.

Tesla Crane, one of the richest women in the world, is on her honeymoon on an interplanetary space liner, cruising between Earth and Mars. She's traveling incognito and is reveling in her anonymity. Then someone is murdered and her husband is named as the prime suspect. To save him from the frame-up, Tesla will risk exposure and face demons from her past.

Even though doing so might make her the next victim.