Industrialist Pierre Verdier kills his mistress Jeanne Ancelin by throwing her off a train. Her husband, Ancelin, decides to take revenge on his wife's murderer, who has been acquitted by justice.
Witness is a 1985 American neo-noir crime thriller film directed by Peter Weir. Starring Harrison Ford, its plot focuses on a police detective protecting an Amish woman and her son, who becomes a target after he witnesses a brutal murder in a Philadelphia railway station.