Film censor Enid takes pride in her meticulous work, guarding unsuspecting audiences from the deleterious effects of watching the gore-filled decapitations and eye gougings she pores over. Her sense of duty to protect is amplified by guilt over her inability to recall details of the long-ago disappearance of her sister, recently declared dead in absentia. When Enid is assigned to review a disturbing film from the archive that echoes her hazy childhood memories, she begins to unravel how this eerie work might be tied to her past.