Very much a thriller in the vein of Harlen Coben, I only read this because it's set on Orkney, and I wanted to relive that landscape. Johnstone evokes the island extremely well, his knowledge of the towns of Kirkwall and Stromness, as well as the more remote areas, is well portrayed. However, the plot and characters are not all that plausible or memorable; the book races along without ever truly convincing this reader that anyone would behave in the manner that these characters do. That's not unusual in a thriller, though, and this is a pretty enjoyable one.