A quality noir drama out of Argentina from director Román Viñoly Barreto, but beware going into it that the titular beast (Guillermo Battaglia) is a real jerk. This is a guy who openly carries on an affair with his business partner's wife, can't keep his hands off his sister-in-law, beats his wife and stepson, and kills a boy in a hit and run. There are many who would love to see him dead (including the viewer!), but none more so than a murder mystery author (Narciso Ibáñez Menta) who wheedles his way closer to him by romancing the sister-in-law (Laura Hidalgo).
The story was adapted from the novel of the same name by Cecil Day-Lewis (Daniel's father), and as Eddie Muller from TCM explains, told out of order to heighten the drama, a technique that worked. Barreto moves the film along well, and the fine cinematography helps create an atmosphere of menace, one felt more acutely because children are involved. Menta's reserved character (and performance) are a great contrast to Battaglia's, and Hidalgo adds sizzle. Overall, quite entertaining, and it was very refreshing that its ending was unencumbered by the American Production Code.