Barry Eisler is, in my opinion, the best thriller writer since the genre's glory days in the '60s, and his half-American/half-Japanese anti-hero John Rain is probably the coolest assassin in fiction, and one of the best characters since James Bond.
If you're in to fitness and martial arts, the Rain novels are must-reads. Eisler lived in Japan for many years, where he earned his Judo black belt at the famous Kodokan. He also knows a bit about Brazilian Jiu-Jitsu, Kali, Sambo, and other fighting arts. The fight scenes in the novels are brutal, believable, and realistic. If you practice a grappling art, reading Eisler will make you want to put down the book and find a partner to roll with. In fact, sometimes before a hard BJJ session, I find myself thinking a variation of Bruce Lee's "Be like water." I think: "Be like Rain!"
Want more proof of Eisler's martial arts cred? Check out this quote from the great BJJ site OnTheMat.com:
Grapplers should be excited to know that going against the typical grain grappling techniques are vividly described in the books many action sequences (in both John Rain's "field" work and in a visit to the famous Kudokan).
(Quick Aside: Barry Eisler's great website features a fantastic article called "Practical Martial Arts Tips from Assassin John Rain" that pretty much sums up my thoughts on the subject.)








