As chief sprayer of green fly to both the Chinese and Indian Embassies, The Optimist is forcibly persuaded to smuggles messages into the Russian and American Embassies via roller towels. MI5 then persuades him to become a double agent and steal top secrets from the Russians. Amidst the mayhem of a poisoned cocktail party, he pulls off the job with the help of a bewitching Agent only to end up in a Chinese restaurant being persuaded by money, and more to the point a meat cleaver, to work once more for his oriental friend.