 Rick McDivitt, an aspiring filmmaker, and his buddy Roger, a champion surfer, hope to make a killing by showing Roger ride breathtaking waves on Oahu s North Beach and the Banzai Pipeline. When Rick runs out of film for the day, he goes back toward his car, and finds another unlocked car nearby with a businessman s jacket draped over the front seat. Rick reaches inside and lifts the wallet from the jacket, then drives to pick up Roger, evading a runaway car driven by a thug named Koa on the way. What Rick and Roger don t know is that Koa has just shoved a knife in the back of the businessman, who was involved with a crooked real-estate deal. Rick and Roger plan to use the businessman s credit cards to finance the rest of the movie, unaware that he s dead and that Koa has seen Rick. When Five-O cops go to interrogate Koa, he tries to use another knife and his kickboxing skills on them, leading to his arrest. However, Five-O can t tie him to the murder. When Rick starts purchasing camera equipment and film with the credit cards, Five-O realizes he may be a murder witness without even knowing it. So do the real-estate developer and his henchman, who go after Rick and Roger themselves.