"Betrayal in Death" is a gripping addition to the popular In Death series by J.D. Robb, following the series protagonist, Lieutenant Eve Dallas, as she navigates a complex murder investigation. The story begins with the discovery of a body in a luxurious hotel, which at first appears to be a simple case of a random killing. However, as Dallas delves deeper into the evidence, she uncovers a web of deceit, betrayal, and connections to the victim's personal life.