In a small town in Massachusetts, a group of friends, fascinated by the internet lore of the Slender Man, attempt to prove that he doesn't actually exist - until one of them mysteriously goes missing.

Based on factual story of composer Joseph Bologne, Chevalier de Saint-Georges, the illegitimate son of an African enslaved and a French plantation owner, who rises to heights in French society as a composer before an ill-fated lov...