This is the third book i've read in this series. The series revolves around a young woman named Sarah who is called upon by the ghost of her dead sister, Vivian to solve crimes. Vivian shows up by temporarily taking over Sarah's body, leaving written messages as to what she should be doing. It's an odd premise, but it works. These are good, reliable books with solid writing and decent characters. I feel good anytime i can pick up one of them. They haven't let me down yet. Series books are often disappointing these days. They tend to be episodes rather than true stories. These are different. Rather than being episodes, like a soap opera that never ends, these are like TV dramas which have a plot that resolves each hour long episode, but has elements of character development that continue throughout them all. In this book Sarah and Vivian take on a bad cop. Good book.