Ann-Margret deserves an academy award for her performance as a manic step-mother who is concerned only with her own needs and desires. Her mood swings from normalcy to manic anger, her manipulation of her teen-age accomplices, her horrible treatment of her husband, and her favoritism for her own daughter over her two step-children...all very realistic portrayals of a manic woman obsessed with having everything her way. It was hard to watch this movie during the scenes leading up to Ruben Borchardt's murder, but they were enlightening. This movie is a must see for anyone who has known a manic person like Diane Borchardt. The post-murder investigation by the two relentless detectives was heartening, all the way up to the convictions of those involved. The classic scene comes at the end when Diane Borchardt is being processed for prison: her only concern is that her husband had a chance to "repent" before he died.
Kudos to the writers and actors who made this movie so realistic!