Promises in Death is Robb's 28th Lt. Eve Dallas book. It's 50 years in the future and the worst criminals are now housed off-planet. But off-planet doesn't mean out-of-touch.
Lt. Dallas is shocked to turn over a murder victim and discover it's another cop. One she knows. Why detective Coltraine was murdered with her own weapon is a long and complicated tale, and there's no better person to root out the answers than Lt. Eve Dallas. Another great murder mystery. Very highly recommended.