Watch Knuckleball (2018) HD Full Movie Free on SolarMovie. Watch Knuckleball (2018) online free. Alone, and targeted on an isolated farm, 12-year-old Henry finds himself at the center of a maelstro...Alone, and targeted on an isolated farm, 12-year-old Henry finds himself at the center of a maelstrom of terror, and a dark family legacy, when his secretive grandfather dies suddenly in the night.