"Loyalty in death" is the tenth book in J. D. Robb's "In death" series, and one of the best books in it at least so far. The series, as you probably already know, is a perfect mixture of futuristic whodunnit + action + romance, and it is set in 2059, in New York City. This book can be read by itself, but you will probably enjoy it much more if you read first "Naked in death", the first book in the series, and then the others that follow it.
In "Loyalty in death" Lieutenant Eve Dallas continues to fight crime, and has to face a dangerous terrorist threat that has its roots in the past. She has the help of her dependable aide Delia Peabody (who is a little distracted due to love problems and a visiting brother), and that of her "civilian" husband, Roarke (who will help her whether she wants his help or not). Both Eve and Roarke receive taunting messages from the terrorist group, that dares Eve to stop them, and makes targets out of Roarke's properties.
The question is, will Eve be able to find and stop the terrorists before they hurt innocent people?. If you want the answer to that question, and are eager to relax while reading a good book, give "Loyalty in death" a try. You won't regret it :)