Even the best "whodunnits" usually feature a number of artificial contrivances to make their complicated plots work. When the plot is engrossing enough, the viewer is happy to forgive the contrivances for the thrills provided. An Inspector Calls is inordinately artificial -- it is set almost claustrophobically in the Birling manse, the plot involves a string of coincidences that are almost laughable, and their revelations by the sly inspector are quite calculated. This is partially redeemed by a twist near the end, but until then the film labors under the weight of the plot's machinations -- and also under the weight of the social conscience that is the real point of the story. It's an admirable conscience, but presented a bit too baldly and thus comes across slightly preachy. That said, the plot does progress in a logical and involving fashion, and the cast is delightful. Alastair Sim could play this role in his sleep and brings his natural understated flair to the part, and a young Bryan Forbes is an added bonus in a role that can be predictable. Guy Hamilton's direction flags a bit, but he provides the appropriate mystical feel that is crucial to the film's ultimate effectiveness. The film is not as socially important as it wants to be, but it is a fine flick for a rainy afternoon.