On his way home, Hoss stops for water at the house of drought stricken family member Jason Gant. While attempting to build a well it caves in on Jason and Hoss saves him. Afterwards Hoss is determined to help Jason strike water.

Tucson gunman, Jack Groat, swore to kill Sheriff Lem Partridge for putting him in prison after a bullet from Groat's gun during a drunken street brawl accidentally killed Sheriff Partridge's wife. Now, 10 years later and fresh out of prison, Groat has tracked retired Lem Partridge to Virginia City and is soon holding Lem's son, Jimmy, and good friend Ben Cartwright hostage. But things go bad and Ben must soon explain to Lem - and try to convince himself - that there was nothing he could have done that day to stop Groat from shooting Jimmy in the back.