Erika Rosenthal has always been secretive with her friend and neighbor, Detective Inspector Gemma James, about her past, except for one telling detail: She and her long-dead husband, David, came to London as refugees from Nazi Germany. But now the elderly woman needs Gemma's help. A unique piece of jewelry stolen from her years ago has mysteriously turned up at a prestigious London auction house. Erika believes the theft may be tied to her husband's death, which had always been assumed a suicide.

Gemma has a tough challenge. She must navigate the shadowy and secretive world of London's monied society to discover the jewelry's connection to David's murderer. However, the cold case needs to be put back on the books and possibly into the hands of her partner, Duncan Kincaid. When a second, present-day murder kicks the investigation into high gear, Gemma becomes more determined to exact justice for Erika in a case that will have lasting repercussions.