The book, adapted by Sean Penn in The Pledge (2001) with Jack Nicholson as the detective who promises a grieving mother he'll catch her child's killer, came later, but this 1958 Swiss-Italian-Spanish co-production is based Friedrich Dürrenmatt's even earlier screenplay - not the book - featuring the chilling child serial killer plot with a more palatable ending - the book's subtitle (The Pledge - Requiem for the Detective Novel) hints at the dark direction Dürrenmatt took with his refashioned plot, while this film, faithful to the earlier screenplay, can be enjoyed as a detective novel proper: a jaunty Swiss mystery with a thrilling police investigation.
★★★★☆
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