This is an extra unused copy of GURPS mysteries. Like many GURPS books, the pages are crammed with information including sidebars. I found the book very good in two aspects: setting up crime scenes for a police procedural and laying out the steps in solving mysteries. The advice strikes a good balance between not making a crime too "railroady" for players but not an open sandbox. My players, at least, are pretty terrible detectives. There are sample templates and detective examples to help players as well.