I randomly picked this on Netflix and the film did well building up suspense. The story is familiar: a man is driven to revenge and vigilantism after his beloved son is brutally beaten and the authorities are of little help. Yet I knew the plot here wouldn't be so simple. The surgeon father is played well but I felt too much time was devoted to just his expressions but that's just me. The climax occurs in the final 15 minutes after the father crosses a line and the ending is left a bit ambiguous, though it's pretty evident justice will eventually prevail. I think American audiences would not like how things turn out but this is a Spanish film that has a far-from-Hollywood ending.