Promises in death - J. D Robb

Every cop gets angry when a police officer is killed. And Lt Eve Dallas is no exception. Throwing every resource into solving Amaryllis Coltraine's brutal murder, Eve encounters bitter opposition from Coltraine's fellow officers, who are desperate to take over the case. But when Eve receives a strange parcel containing Coltraine's badge and a threatening note, she knows the case has just got personal. Then Amaryllis is linked to millionaire Alex Ricker, son of a criminal Eve had put behind bars. Did Amaryllis leak information to him and then have a change of heart? Eve must put herself in extreme danger to get to the truth...