An American scientist, Dr. John Hathaway (Gregory Peck), is sent to Red China to steal a formula for a newly developed agricultural enzyme. Unbeknownst to him, a micro-sized bomb has been implanted in his brain so that he can be eliminated if the mission fails. As Hathaway navigates the treacherous world of espionage, he must also contend with Ting Ling (Zienia Merton), a beautiful Chinese woman who introduces him to China's Party Chairman and becomes embroiled in a complex web of intrigue.