Five by Ursula Archer

Detective Inspector Beatrice Kaspary and her partner, Florin Wenninger, find themselves at the mercy of a serial killer when they are given the case of a murdered woman who has GPS coordinates tattooed on her feet. It is the first step in a journey that has the two deciphering clues, unearthing body parts via geocaching and attempting to get one step ahead of the killer so they can prevent more deaths.  Five, while set in Salzburg, Austria, is reminiscent of mysteries by Scandinavian authors, such as Sara Blaedel, Mons Kallentoft, and Helene Tursten.