The Club Ten resort is a center of diamond smuggling. One of the gang, Felipe, has double-crossed his cohorts and they are after him. Golf pro Ted and henchman Randy catch him, and when he refuses to divulge the whereabouts of the diamonds he stole, they capture his companion, Laura Ferguson, in the act of making a call for help.
The call is received by Roxanne. She contacts Walter, who was specified in the call. At Laura's apartment, they interrupt a burglar stealing the tape containing her message. Walter gets it back; the burglar escapes. He is Roger Crandall, the gang's ringleader, and he returns to Club Ten to tell Geri, the Recreation Director, of his failure to get the message tape. They have only 72 hours to recover the diamonds, or their lives are in danger. At headquarters, Roxanne insists on helping her friend, and Capt. Boyd sends Walter along as backup. Crandall recognizes them at the hotel, and decides to let them lead him to the stones.
Laura and Felipe are being held in a villa on the island. Roxanne, Walter and Automan search her bungalow for clues. Walter goes out to ask around about her, and ambushes a man who has been tailing he and Roxanne. It is Renaud, a local policeman, who tells him of Crandall's operation. In the villa, Felipe is caught trying to escape and is killed.
Walter decides to draw out the smugglers by pretending to have the diamonds and spending money freely to prove it. Automan gets a loan from an automated teller, and they go on a spree. The ploy pays off when Roxanne is kidnapped by golf pro Ted and used as báit in a trap to make Laura reveal the location of the jewels. Walter catches Ted rummaging through his bungalow, gives chase, and is knocked out by Randy. He wakes up in a sand trap next to Felipe's corpse, holding the murder weapon. Renaud puts him in jail in "protective custody."
Meanwhile, Boyd receives an angry teletype from Renaud concerning Walter's invasion of his jurisdiction, and he sends Jack to bring Walter back. In jail, Walter puts in a distress call to Automan, who rezzes up and merges with Walter, walking through the wall to safety. They avoid a police chase and return to Laura's bungalow, where they find Jack and decode the message she left on her typewriter ribbon. At that moment, Laura breaks and reveals the diamonds are in the dining hall aquarium. Walter nabs Geri at the aquarium, only to find Crandall behind him. Crandall turns on Geri, but Jack arrives to turn the tables again. Randy makes off with Roxanne and Laura, but Automan and Walter pursue in the Autocar and bring him in.
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