11 Harrowhouse (also known as Fast Fortune) is a 1974 British heist comedy thriller film directed by Aram Avakian and starring Charles Grodin, Candice Bergen, James Mason, Trevor Howard, and John Gielgud.

When the diamond is stolen from him, he is blackmailed into pulling off a major heist at "The System," located at 11 Harrowhouse Street, City of London with the help of his beautiful and wealthy girlfriend.

Although The System has an elaborate network of defences and alarms against intruders, the robbery is carried out at night by gaining access to the roof from an adjacent property and threading a hosepipe down a conduit into the vault, where Watts uses it to vacuum up thousands of rough diamonds out of their drawers.

"[2] The Monthly Film Bulletin wrote: "Despite many incidental felicities, Aram Avakian seems to have had some difficulty finding the right tone for this robbery caper, which ultimately tumbles between several stools into that timehonoured transatlantic cliché: the American outsider grappling with a bland wall of English bowlers, brollies and phlegm.

At the outset, the device of having Chesser's off-screen voice quietly introducing himself behind the credits, and hinting at the subversive role he will soon be playing while we watch an attempted robbery being foiled (the System's security guards cheerfully blow up the thieves), seems to be a grave miscalculation: what has interior monologue to do with this glossy, James Bondian world?

The last sequences, in fact, are an unqualified disaster: an elaborate, badly constructed and totally unfunny car chase (its clichéd awfulness compounded by the admixture of a fox-hunting motif) which presupposes that everyone has gone momentarily mad.

Variety wrote: "Grodin messes up the film with ineffective shy-guy acting, and clobbers it with catatonic voice-over that is supposed to be funny ... Howard and Mason appear close to embarrassed in their roles.

Only the bullish playing saves the day, as Aram Avakian's direction is so slipshod that the enterprise has descended into low farce long before the extended chase finale.