The wife of a kidnapped scientist seeks help to free her husband.
Gavilan draws the attention of pirates when he salvages gold from the deep off the Virgin Islands.
Japanese gangsters stalk Gavilan after he foils their attempts to steal an ancient sword.
Gavilan is kidnapped and taken to Cuba to work on an experimental turbine, unaware that he's actually there to help a scientist's daughter defect to the U.S.
Gavilan infiltrates the fortress of an arms dealer who plans to equip high-speed boats for warfare.
Milo is held hostage until Gavilan recovers $3 million in heroin.
Gavilan tries to rescue a friend from a Turkish prison.
Gavilan becomes the scuba instructor for a boozing millionaire, hoping to straighten him out and get him to halt his whaling operation.
Gavilan tries to stop an American living in England from dealing stolen NATO arms to terrorist groups.
Gavilan is stalked by members of a Nazi faction who think he has the mysterious crystal pyramid they lost in a plane crash.
