A deputy must escort a longtime friend to be hanged for the crime of murdering his wife's parents. Along the way he discovers the startling truth about the murders, and is forced to face the real danger.

Dual follows drifter Luke Twain in the late 1800s when he discovers a town where all the inhabitants has been brutally murdered. Making a choice to remain and uncover what took place there, he finds himself in a strange game of cat and mouse with a mysterious man that still has one final mission...