Book of the Dead by Patricia Cornwell
As a serial killer moves between the United States and Italy, Kay Scarpetta and her team try to piece together the clues — which include e-mails with pictures of other victims — to find the brutal slayer of an American tennis pro. Even returning from Italy to her new private forensics lab in Charleston, S.C., with forensic psychologist Benton Wesley’s engagement ring on her finger doesn’t ease the strain of their relationship, and it creates new problems with longtime co-worker Peter Marino.
Adding to Scarpetta’s problems is the discovery of a connection between the tennis pro murder, the unidentified body of a small boy and the manipulations of an emotionally disturbed psychotherapist who hates her.
You can find Book of the Dead by Patricia Cornwell here.