I use audio books to help me get through the most boring and mundane tasks of my everyday life: commuting, washing dishes, mopping floors, folding laundry, running on a treadmill, etc. For this reason, I require the most exciting, gripping mysteries to keep my attention. No in-depth analysis or academic meanderings for me. The more harrowing and heart wrenching, the better, which is why I find myself drawn to missing person mysteries more than any other sub genre.