Plot

A small-time con artist and a Hawaiian real estate developer's mischevious, enterprising mistress team up for a potential $200,000 score.

Jack Ryan, a charming but mischievous kid with a history of small cons, never nasty, as he always approaches life from the pleasant side, goes to surfers paradise Hawai, where dodgy district judge Walter Crewes enlists him to get to real big criminals. Jack finds himself teaming up in bed and thieving 'business' with Nancy Hayes, the greedy mistress of evil hotel magnate Ray Ritchie and his dumb lieutenant Bob Rogers, Jr. and a real temptress gold-digger but is about the only one without an hidden agenda...—KGF Vissers

Jack Ryan, a surfer and small-time thief, has a fight with the intimidating Lou Harris, involving a baseball bat. Harris is a foreman on a Hawaii construction site run by duplicitous millionaire Ray Ritchie. When Jack is released from jail, both the police and Ritchie's business partner, Bob Rogers Jr., tell Jack to leave the island.

However, Judge Walter Crewes takes a liking to Jack and offers him a place to stay and a job as a handyman at a small resort of beach-front bungalows that he owns. Jack has treacherous encounters with Harris and Rogers Jr., on numerous occasions.

Ritchie has all his (substantial) property registered in the name of his wife, Alison. He is also cheating on her with a much younger woman, Nancy Hayes. When Nancy takes an interest in Jack, the Judge warns him that she likes "the criminal type" and cannot be trusted. Jack is falling for Nancy, and they break into houses for fun and profit.

Nancy suggests to Jack a scheme to steal $200,000 that Ritchie is keeping for bribes and mob business. She arranges for him to sneak into Ritchie's house to steal the money from his safe. Jack arrives to find Ritchie face down motionless and his friend Frank shot and lifeless (although he does jump up and run off moments after he's hit the ground, only wounded superficially).

In a conspiracy with Alison, Nancy has set up Jack to be Ritchie's "killer", with Alison to shoot him dead as an intruder. Alison blundered by overdosing Ritchie with poison, and shot the wrong man, Frank.

It is revealed that Judge Crewes tried to make Jack the patsy as he is Alison's lover and has been part of the conspiracy, with the two promising to give Nancy the $200,000 for her part. Jack manages to steal the money from the safe and before Nancy can, narrowly escaping and leaving Alison and Crewes to frame Nancy as Ritchie's killer.

Alison and Crewes are seen sailing Ritchie's yacht, disposing of his body in the ocean. Nancy is in disguise, trying to escape the island before she is arrested for Ritchie's disappearance and murder. Jack spots Nancy as he's driving past her in a limousine, stopping to wish her well and refusing to help her after her attempt to frame him. He departs with the money and the beautiful vacationer from bungalow number 9 he met while working at Judge Crewe's resort.