The trouble with director Sean Penn's mostly-gripping The Pledge, about a cop who promises a grieving mother to find the killer of her child, is not Jack Nicholson's gnarlier-than-usual detective (compare him with the clean-cut Foyle-like turns of It Happened In Broad Daylight's Heinz Rührmann and Cold Light of Day's Richard E Grant) nor the story's movement from the Swiss Alps to Nevada, but Penn's muddling Dürrenmatt's screenplay - a jaunty mystery with a detective-novel ending - with the author's later book, "The Pledge - Requiem for the Detective Novel, which refashions that screenplay's plot into a much darker existential drama; Penn borrows scenes from the earlier 1958 adaptation and incorporates aspects of the screenplay (such as a sequence that demystifies the serial killer), and so detracts from the book's grim philosophy.
★★★☆☆
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