Flesh Traders. Ben Hood Thrillers, #3

The flesh traders kidnap daughters of the wealthiest people in the world, ship them secretly to Australia, brainwash and terrorise them before selling them as sex slaves in an exclusive underwater resort. Parents are forced to make regular ransom payments, or have their daughters killed. Only ex-detective Ben Hood (desperately attempting to take a relaxing holiday) could accidently stumble into an operation so sinister and dangerous.
They know he knows. They have engaged the most bizarre and deadly hit man in Australia to take him out. Only a crazy person would attempt to smash this operation and try to rescue any of these girls. Then again, this is Ben Hood and they say he is a little crazy.