A supermodel is murdered and Eve's best friend, Mavis, becomes the prime suspect. Also suspect is Mavis's boyfriend, Leonardo, who just happens to be the designer of Dallas's wedding dress. While investigating the murder and digging up the dirt on the fashion world, Dallas discovers that the model (and most of the suspects) are either consuming or dealing a new and illegal youth serum.
It's hard to guess the murderer is in this book, the entire mystery is well written by Robb who keeps the reader guessing.
Mavis's character is brought out in more depth, and Peabody's character is broadened as well making her Eve's aide. Roarke and Eve's relationship shows more depth in this book then in the previous books and we learn more about Roarke's background.
Read the entire series of these "in Death" books, start with Naked in Death the first of the series. They are all excellent.