A town Marshal, despite the disagreements of his newlywed bride and the townspeople around him, must face a gang of deadly killers alone at "high noon" when the gang leader, an outlaw he "sent up" years ago, arrives on the noon train.
A distant poor relative of the Duke D'Ascoyne plots to inherit the title by murdering the eight other heirs who stand ahead of him in the line of succession.
Retired Old West gunslinger William Munny reluctantly takes on one last job, with the help of his old partner Ned Logan and a young man, The "Schofield Kid."