The Guardians — R.J. Archer

From the author of the Seeds Of Civilization series-comes THE GUARDIANS. The third in a four-book series called Parallel Ops features Tony Nicoletti. After flying to Cancun to attend the wedding of his friends, Linda and Javier, Tony vanished for more than five years but now he's back and he's fighting mad! Yes, the free-wheeling, act-first and think-later Tony Nicoletti that you came to love in the Seeds of Civilization series is back and he's on a mission. For more than five years, Tony Nicoletti was held captive in a secret underground complex. Now he's free and on a quest to protect a mysterious underwater secret while at the same time seeking to destroy those who imprisoned him. After escaping captivity in Cancun, Tony Nicoletti finds himself on the doorstep of a bar along the Belize City waterfront. Befriended by a barmaid and a retired American, his journey takes him across the Caribbean and into the deepest danger of all.