Action & Adventure, Contemporary 

The island of Sinos. Strategically positioned between Greece and Turkey, this small Mediterranean isle is a relic of the past--an old Turkish stronghold fortified by the Nazis during World War II. Now it has become a prison for political offenders from the Greek mainland. A fortress of grim solitude andsecrets, Sinos is the last place anyone would voluntarily enter--but deep sea diver Jack Savage has little choice. After losing his boat in a suspicious explosion, Savage is approached by shipping magnate Dimitri Aleko. The multi-millionaire has taken an extreme interest in Savage's background as a Royal Marine Commando and his expertise in underwater sabotage. Aleko also has a job for Savage: masterminding the ultimate breakout...For on the prison island of Sinos, one man holds the fate of thousands in his hands. And Jack Savage is the key to unlocking that fate. - from Amzon