"When Sophia Galich was twelve, she starred in her older sister Layla's amateur horror movie Vermillion, which recorded raw footage of her very real reactions to scenes her sister concocted in their old Californian house on the coast--Cashore House. In the years after the film's release, Sophia's relationship with her sister became more strained, while her memories of the now-infamous house fueled her nightmares. Vermillion amassed an army of fanatical...