Series numeration from FantasticFiction.

"Detective Jonathan Stride's first wife, Cindy, died of cancer eight years agao, but her ghost hangs over Stride's relationship with his current lover, and fellow detective, Serena Dial. When Serena Witnesses a brutal murder outside a Duluth bar, she stumbles onto a case with roots that go all the way back to the last year of Cindy Stride's life. At the time, Cind and Stride were on opposite sides of a domestic murder investigation. Janine Snow--a brilliant, successful surgeon transplanted to Duluth from Texas--was the prime suspect in the shooting death of her husband. Cindy believed her firend Janine was innocent, but Stride thought all the evidence pointed to the surgeon, even though the murder weapon was never found. Despite Cindy's attempts to help Janine, the case led to a high-profile trial. As STride and Serena tackle a new murder investigation--with links to a human trafficking ring targeting women in the Dulut port--he begins to question whether he made a terrible mistake eight years ago. Could Cindy have been right about Janine Snow all along." -- from dust jacket.