Culdesac is a 1966 British psychological comic thriller directed by the FrancoPolish director Roman Polanski. It was his second film in English, written by Polanski and Grard Brach.
The film begins with gruff American gangster Dickey pushing his brokendown car along a causeway through rising seawater while his eccentric companion Albie lies inside, bleeding from a gunshot wound after a bungled robbery. Cut off by the unexpected rising tide, they are on the only road to a bleak and remote tidal island Lindisfarne in Northumberland, where, in a dark castle on a hilltop, a highly neurotic Englishman named George lives with his pretty and promiscuous young French wife Teresa. Dickey disconnects the phone lines and proceeds to hold the two hostage while awaiting further instructions from his underworld boss, the mysterious Katelbach.When Albie dies from his injuries, Dickey decides to take over the castle as George grows increasingly paranoid and hysterical, Teresa increasingly flirtatious, and Dickey ever more thuggish and violent. George briefly entertains some of his obnoxious friends who show up at the castle unannounced, leading Dickey to pose as a servant while Teresa begins to flirt with one of the guests, Cecil. ........
Source: Wikipedia