How to Kill 400 Duponts on AllMovie

We can't find How to Kill 400 Duponts in the official movie resume of star Terry-Thomas, leading us to conjecture that the film might have been designed for television. The toothy protagonist plays a Scotland Yard inspector, assigned to a series of high-profile murders. Someone is methodically killing members of France's Dupont Family. If you want to know the reason why, we refer you to this film's role model, Kind Hearts and Coronets. The humor ranges from dry to droll to just plain dippy.