Watch Showdown at Shelby's Shack (2019) HD Full Movie Free on SolarMovie. Watch Showdown at Shelby's Shack (2019) online free. Sheriff Austin Shelby is determined to uncover the dangerous & deadly facts behind the Nellie Harper...Sheriff Austin Shelby is determined to uncover the dangerous & deadly facts behind the Nellie Harper murder for hire plot. After an attempt on his own life the Sheriff teams up with a mysterious US Marshal who has just arrived in town.