The Robber Bride (2007)

The facts: journalist Zenia Arden is missing, her abandoned car is found with three pints of her blood splattered inside, and one of her fingers severed from her body is found close to the car. From these facts, the authorities believe there is no way she could have survived what looks to be a brutal slaying. Henry Kelly, her police-officer secret boyfriend, believes he will be implicated as the murderer and goes to his old friend John Grismer, an ex-police officer now insurance investigator, to help him uncover what happened to Zenia. John finds that Zenia's three supposedly closest friends--magazine editor Roz Andrews, university history professor Tony Fremont, and yoga instructor Charis White--are all less than sad at Zenia's death and are open about their lack of remorse when John questions them. Apparently, Zenia came unexpectedly and independently into each of their lives, made it great for a while before she did something intentionally to ruin their friendship. As John uncovers some of the information regarding Zenia's relationship with these three women, he finds that the bonds of friendship go deep.