I liked this movie. It wasn't really about murder as much as about jealousy, obsession and about other conditions that can drive a normally sane person over the edge. It illustrated human frailty and imperfection very well. There were a lot of twists in the plot and great acting by all. Sarah Polley and Catherine McCormack in particular, were excellent. It was like seeing the same person in parallel time periods, suffering the same emotions. The dark haired sister Karen seemed cruel as she taunted Maren with tails of their brother coming to America. While Adaline wasn't nearly as "cruel", her ceaseless tactics of seduction right in front of Jean seemed inappropriate and inconsiderate to say the least. I think this is a very well plotted and enjoyable mystery thriller.
Review of The Weight of Water
