Suicide bombers are easy to spot. They give out all kinds of telltale signs. Mostly because they're nervous. By definition they're all first-timers.
This is how Lee Child's 13th Reacher novel opens, and Jack Reacher, the former Military Policeman and current drifter who is a combination of Sherlock Holmes and focused Viking beserker, remains the best thriller character going today. It's no wonder that "Reacher's Creatures" includes such fans as Stephen King, Hugo and Nebula award winning SF writer John Varley, and new convert SI.com NFL columnist Peter King. Oh, and your humble Babble On scribe. I cannot recommend this entire series highly enough.