Literally one of the best things ever written.

Spoiler: She was Him in a past life, and He was Her.

An investigative reporter is hired to solve a decades old murder case. A young woman went missing and her body was never found. Each year on her birthday, her grandfather receives a framed flower. He believes it is from her killer meant to taunt him. The investigation turns up hidden skeletons of the family including, incest, Nazis and the fact that the man who currently runs the family business is a serial killer. The twist? The young woman everyone presumed dead is actually still alive and living in Australia under a different name. She fled to escape the sexual abuse she was being subjected to. It was her who sent the flowers as a way to let her grandfather know that she was alive and well.

A prosecuting attorney (Harrison Ford) is accused of viciously raping and murdering a woman he’s had an affair with. All the evidence including his semen points to him as the killer. Eventually he is acquitted when his defense lawyer is able to find a flaw in the case against him The twist? As he rummages through his basement he finds the hammer which was used to kill the woman. It still has traces of her blood and hair. Turns out it was his wife (Bonnie Bedelia) who committed the murder as a form of revenge, using her knowledge of the cases he’s prosecuted in the past to commit the perfect murder including collecting and saving her husband’s semen after sex and injected it into the victim. In the end Ford is faced with a decision, turn his wife in or keep quiet and preserve their marriage. He chooses to wash the hammer of all evidence.