It is 1879.Rock Beckler wants to cross Angus cattle with his herd of Texas Longhorns. Getting the black cows to his ranch in the Bitter Root Valley in the Montana Territory is going to be a challenge though. The cattle will have to be trailed in. That could take three months, maybe even longer depending on where they can be found. Then an old friend by the name of Badger McCune writes Rock about some black cows down by Cheyenne...