How are you feeling after seeing Longlegs? Unsettled? Spooked? Like you've got the teeth of the hydra upon you?

That's more than understandable. The latest film from writer/director Osgood Perkins is packed with eerie atmosphere, Silence of the Lambs–style serial killer investigations, Satan worship, and a surprising number of references to the glam rock band T. Rex. All this leads to an ending that crawls under your skin — and may leave you with some questions along the way. From killer nuns to satanic symbols, let's break down Longlegs and its ending.