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In order to explain where this wicked bride comes from, the filmmakers throw in a confusing introduction, which takes us back to Mexico in 1673. A beautiful woman wearing a necklace, which she swears she will keep forever, is drowning her own children. Her reasons for doing so aren't revealed until later on in the movie. Instead, the story leaps forward 300 years to Los Angeles 1973.
Linda Cardellini plays widowed social worker Anna Tate-Garcia. She quickly establishes that her character is grief-stricken (she is still mourning her policeman husband), ambitious in her career, and utterly dedicated to her children, Chris and Sam.
We briefly see Anna and the kids rushing for the school bus and there is one scene where she is told off by her boss for being distracted and late for work. Anna refuses to let her younger colleague take over her cases. She insists on seeing one particularly troubled client, Patricia Alvarez, and her two sons. The moment she arrives at Patricia's house, the shock tactics begin in earnest -- and they don't let up until the final credits.