My rating: 4 of 5 stars
A refinement of letterboxing, geocaching is a popular worldwide hobby that involves using GPS to hide and find small containers holding a logbook and, often, a small object that the finder can trade for another small object of equal value. The location coordinates are provided on a listing website, where finders can post about their hunt.
In Five, the caches contain human body parts. A geocacher, dubbed The Owner by the Salzburg police, dumps a body in a cow pasture, with a sequence of numbers tattooed on her feet. The investigative team, led by Beatrice Kaspary, soon figures out that the numbers are GPS coordinates, and, led by a rookie who’s into geocaching, they manage to make their first gruesome discovery. Along with a bloody hand, the killer provides a riddle, which when solved, will lead the cops to the next victim. And the next… DI Kaspary and her assistant, Florin Wessinger, will come to realize that the victims knew each other, but that’s all they have to go on.
Gritty and suspenseful, Five is a complex mystery with a flawed but personable protagonist. She and Florin make an efficient team, and there are some strong hints that their relationship will develop beyond the professional. When it becomes clear that The Owner is watching her, Beatrice begins to fear for the safety of her children. It’s possible for the reader to narrow down the roster of possible perpetrators, but I wasn’t certain till the end which of the two I suspected was guilty. An original premise with plenty to captivate and entertain those who open the covers of this thriller. It may also encourage some to take up a new hobby!