I'm not quite the fan of this thriller that several other IMDb contributors are. I agree that it has some first-rate acting by Ingrid Thulin as a concentration camp survivor still smitten with her wastrel husband after four years of hell, Samantha Egger as her homicidal stepdaughter and Maxmilian Schell as the penniless scoundrel both women crave. And there's no question that the sensual bathtub murder, complete with a touch of foot fetishism, was well ahead of its time. But from the symbolic opening (a child falling off a speeding railway train while Thulin looks stoically on) through the climactic get-rich-quick scheme, the film is unrelentingly grim. J. Lee Thompson's direction, which assumes that slow-moving and suspenseful are synonyms doesn't help much. And in the end, the characters (aside from Herbert Lom's likable doctor) are not only unsympathetic but don't make much sense.
Review of Return from the Ashes
