Perché uccidi ancora (English title: Blue Summer) is a 1965 Italian western film adventure directed by José Antonio de la Loma and Edoardo Mulargia.

[1][2] Steven MacDougall quits the army when he receives the message that his father has been gunned down by a member of the Lopez clan.

He hurries to protect his kin but the Lopez clan knows that he's coming.

When he's eventually joined his family, their farm is attacked, yet Steven fights of his enemies another time.

Now the fiendish Lopez clan hires a professional assassin from outside.