Watch He Knows You're Alone (1980) HD Full Movie Free on solarmovie.do. Watch He Knows You're Alone (1980) online free. A young bride-to-be is being stalked upon by a serial killer in Staten Island. She gets help from a ...A young bride-to-be is being stalked upon by a serial killer in Staten Island. She gets help from a former lover, but will they manage to escape?