- Dr. Royce, a scientist with an expertise that can be used in the underwater detection of ships, is lured by enemy agents and his girlfriend to defect to a foreign power. McGarrett is both helped and hindered by a federal agent named Merrill Carson in trying to prevent Royce from leaving the island with the enemy agents, even as Dr. Royce gradually realizes that he is more a prisoner than a willing defector.—aldanoli
- A renowned scientist Dr. Royce (Charles Aidman) gets a phone call from his lover Theresa (Pilar Seurat), she is distraught over the fact that her *uncle* is going to be deported for being in the country illegally. He rushes to her side at her apartment, they are confronted by a man and Royce shoots him and the two flee. Enter Kreuter, the *uncle*, who then has another henchman assure that the intruder is dead by firing a real shot (instead of Royce`s blank).
McGarrett and Five-O are investigating the scene where he meets Carson, the federal agent assigned the Royce case. McGarrett and Danny are taken to Royce`s lab to see his research. Royce is working on a sensor that can detect the passage of any metallic substance in the water, like a submarine. If fully developed, tracking enemy ships with NOSE (the name for the technology) will allow for a cold war superiority in the seas.
Theresa takes Royce to her *uncle`s* house in a secluded area near some road construction. Her *uncle* Kreuter shows up and offers to protect Royce and Theresa by having them get off the island via a submarine. Royce is confused and knows if he can explain it all he will convince HPD and McGarrett. Kreuter tries to convince Royce of the danger to Theresa, she is also an illegal alien and would be in severe trouble if the murder investigation includes her.
Kono is watching Theresa`s apartment when she shows up to get her mail. She has a letter from the INS (immigration and naturalization services) that her interview for citizenship is coming up. Carson`s men mistake Kono for a foreign agent and render him unconcious.
Back at the house, Royce is allowed some time to take a walk while Kreuter pressures Theresa to be more forthcoming to Royce, to seduce him to be more cooperative in leaving the country. While on his walk, Royce decides to contact Five-O and makes a call from a phone booth. One of Royce`s thugs has followed him and interrupts the call, but McGarrett taped part of the call.
Royce now understands that he was a patsy, used by Theresa and now her *uncle* in a plot to get him to leave the country with his ideas and research for sale to foreign powers. Meanwhile McGarrett and Five-O listen to the phone call tape recording, and McGarrett hears the construction equipment. He knows it`s a pile driver, and contacts city public works for all construction sites. As Five-O rushes away toward the sites identified, Carson and his men follow knowing Five-O is close to finding Royce.
Kreuter has his team including Dr. Royce leave the house in an Island Star baking truck. A construction worker sees the truck. Five-O arrives 15 minutes too late but talk with worker, and All Points Bulliten is put out for the truck. Five-O split up and Kono and Chin are closest when HPD spots the truck so they move on it. McGarrett and Danny are close behind.
Kreuter`s team has ditched the truck and loosely covered it with vegatation. Chin and Kono found it and await McGarrett and Danny. All four move toward the beach, eventually splitting into two teams of two each. Kreuter signals the submarine off shore for the pick up.
As Five-O moves in, Theresa picks up some sand and when McGarrett shouts to Kreuter the shooting starts. Theresa throws the sand at one of Kreuter`s thugs temporarily blinding him and runs off down the beach. Kreuter shoots at her and then Royce rushes to her side. Kreuter is about to shoot Royce when McGarrett guns Kreuter down. Carson arrives as the remaining thugs are taken into custody. Carson sees Royce and mentions to McGarrett that though Theresa is dead it is not that important. McGarrett looks at Royce holding Theresa and states "It`s important" and leaves the beach.
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