Watch The Warning (2018) HD Full Movie Free on SolarMovie. Watch The Warning (2018) online free. Ten-year-old Nico receives a threatening letter and now his life is in danger. No one seems to belie...Ten-year-old Nico receives a threatening letter and now his life is in danger. No one seems to believe him except one person that he doesn't know who has come to believe that fate itself wants the boy dead and tries to prevent it.