Lee Van Cleef stars as an Apache Captain in the Union army trying to discover the significance of an agents dying words, 'April Morning'. Soon he is up to his neck in trouble and bodies as anyone who knows anything about 'April Morning' is quickly shot before they can pass on the secret. With nowhere to turn he forms an uneasy alliance with Griffin, a gun runner, a gambler and land owner, but Griffin is also not to be trusted as the Captain soon finds out.