An American draft dodger and aspiring writer named Nero Finnigan becomes involved with the notorious Mr. Go, an organized crime mastermind. They conspire to blackmail an American weapons scientist into providing secrets to Mr. Go's organization for resale to the highest bidder. "The Dolphin" then arrives, who is an American CIA agent and James Joyce scholar, and is charged with recovering the scientist and his work by whatever means necessary.

1970年1月占士美臣(James Mason) 來香港取景拍攝電影 《雙面人顧先生》 The Yin and the Yang of Mr. Go (aka The Third Eye) ，邀請導演胡金銓客串飾演日本商人一角，片酬高達十六萬港元，打破港台兩地演員片酬紀錄，無人可望其项背。

A Hong-Kong, un agent de la CIA doit récupérer les plans volés d'une arme dévastatrice. Mais il doit pour cela faire équipe avec un espion russe.