The team recovers a Roman plate that holds research on a synthetic gill unit tied to the research of a Professor Prendergast. Judson loses the plate when he and the curator are attacked while Gabe and Mac track the doctor to an insane asylum where he insists he is from Atlantis.
Adventure Inc. is recruited by St. Edmunds Abbey to retrieve a stolen gold and jeweled Angel that is believed to carry protective powers. They are contacted by a monk, Brother John, who is sworn to silence and thinks he knows where the Angel is. The trail leads to London where mobsters try to take out Lucy Wyle, a bar and casino owner who has the Angel and refuses to sell it.
While traveling across the desert, Gabe falls into a secret underground chamber and some locals open fire on the others when they attempt a rescue. They escape and meet with a local ruler, Omar, who offers to help but is more concerned about finding a missing fortress than finding Gabriel.
In Val Verde, South America a woman with a lethal "hellsgate virus" takes refuge on the Vast Explorer and the local government seals the ship, cutting it off from the outside world. The local government plans to use the crew to generate vaccine with no concern for the team's lives. Worse, the local colonel plans to use the plague as a biological weapon. Even the American consul is a fake sent in by the colonel.
The team is brought in by a corporation to determine why a simulated Mars Mission project failed and five people disappeared. They are soon plagued by strange accidents themselvs and realize that the main computer is suffering from a programming glitch.
The team gets involved in the hunt for the "Sunda Man", an ancient mummified man. Professor Halpern believes the mummified "Sunda Man" holds the DNA secret to longevity, a museum wants to sell it, and mysterious men are chasing after it.
The Adventure Inc team go in search of a helicopter shot down in Cambodia during the Vietnam War.