To kill the Valko kid

the long version

Retired marshal Clem Everett rides into Sioux City a few moments after the infamous bounty hunter Johnny Sunset arrived and it was not long before Clem discovers that the man known as the Sunset Kid is only there to claim the reward money on his old pal Valko. From an arrangement made way back, Clem knows Valko is due to appear in the city that night. The clock is ticking toward midnight and there is no way to warn his friend that the deadliest bounty hunter in the West is intent on gunning him down. Time is up for the Valko kid ...