Over The Edge is the third in a series of (so far) 4 books: The Unsung Hero, The Defiant Hero, Over the Edge and Out of Control. Although the main plot in each book can be read in isolation, I recommend reading them in order as there is a significant secondary story line which builds up with each book. The books are about a team of US Navy SEALS and each book is usually dedicated to one team member.
I am normally not interested in reading about soldiers, but something about these stories really captured my attention, in particulare Over the Edge. The characters are very vivid, the action fast moving and the various threads cleverly interwoven. I for one can't wait for the fifth book to come out...