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In this film based on actual events, Karla Homolka (Laura Prepon) and Paul Bernardo (Misha Collins) seem like a typical suburban couple -- that is, until Paul is implicated in a series of disturbing killings. It turns out Karla married Paul knowing he had raped and killed several girls, including her own sister, Tammy (Cherilyn Hayres). As the evidence mounts against Paul, Karla is questioned by Dr. Arnold (Patrick Bauchau) about her level of involvement in the murders. Wikipedia