Watch Mask of Thorn (2019) HD Full Movie Free on solarmovie.do. Watch Mask of Thorn (2019) online free. Bethany has been kidnapped by Avondale's popular kids for a surprise birthday party to celebrate her...Bethany has been kidnapped by Avondale's popular kids for a surprise birthday party to celebrate her sweet 16. They don't realize that Bethany is the target of the monstrous 'Thorn', and nothing will stand in his way.