FIREWALKERS is a sequel to FIREWALKER, the first in this X-Files-esque series from author Chris Roberson. If you haven't yet read FIREWALKER than don't read FIREWALKERS. Start at the beginning. The two books are meant to be read back to back, as FIREWALKERS picks up immediately following the ending of FIREWALKER, and there's not much in the way of getting up to speed.
Taken as a whole, FIREWALKER/FIREWALKERS is a fun, fast read. Think X-files with a bit of Haitian and Polynesian flavor. The characters are fun and the city of Recondito is very well realized, but I was a bit disappointed with this finale. The big bad of the story could have been really cool, but comes across as very lame. It doesn't really do much and it never felt as if our heroes were in any sort of real danger. The best way to describe FIREWALKERS would be "breezy". It's a very quick, fun read, but you forget about it the moment that you close the book.
Both books are still worth checking out, and I wouldn't be opposed to reading further adventures featuring these characters, but I hope that if Roberson does another book, he gives this one a bit more depth.