The Christopher Killer by Alane Ferguson is a modern Nancy Drew/CSI/Patricia Cornwell mystery for young adults.

Seventeen year old Cameryn Mahoney helps her father, the county coroner, to solve the murder of a victim of a serial killer who leaves St. Christopher medals on his victims.

There's a graphic description of the autopsy and a "made-for-tv" capture of the murderer but it reads fast and I would recommend it to our older teen readers.