Brice, a secret service agent, seeks information regarding stolen silver which disappeared from the government in 1804. Hade and Milo seek the fortune for themselves, as do the "conches" natives of Florida since the time the money was buried. Claire, half sister of Milo, falls in love with Brice, who is captured by Milo and Hade and taken to an island where he is to be killed. He is rescued by another secret service agent. He escapes the island after being thrown into a sea of sharks. Claire and Brice are captured by the "conches" from whose camp they escape. After they have returned to Claire's home, Milo advances on Brice just as "conches" attack the house through a secret tunnel. They are repulsed by a stream of boiling water poured into the tunnel. Hade is arrested, later escapes but to meet his death wandering in the everglades. The government takes possession of the money and Brice takes possession of a wife.