Perfect Number (movie, 2012)

Based on the series by the popular Japanese novelist Keigo Higashino, this is a mystery drama that 'faithfully but freely' adapts the 3rd part in the series, . The story revolves around 3 characters: a woman who unwittingly killed her husband, a math genius next door who sets up a perfect alibi for her out of his attraction toward her, and a detective who closely traces her, finding the alibi suspicious.