The Thorn novels have a great appeal to me since I have enjoyed spending time in the Florida Keys - sailing, SCUBA diving, Key West partying, etc. After meeting James Hall in a South Florida bookstore on the day his first Thorn Novel (Under Cover of Daylight) arrived in paperback, I became a fan.
You will too if you enjoy novels that move along, well plotted, good characterization and great location descriptions. This one fits the mold. I enjoyed the diversion to D.C. since I spent a lot of time there growing up.
Sad that his tales now go straight to paperback when I feel he deserves more renown. His novels are just as good as many contemporary "big buck masters" and he deserves to be more widely read. Hope some bright Hollywood type also realizes this character, a guy who ties bone fish flies for a living and resides in the Keys who manages to get in to all sorts of interesting situations.