The found-footage, scary-movie genre appears to be discreetly evolving away from the convention of being filmed from a single-camera position, and that we are watching a tape recovered from the site of some mysterious event. As Above, So Below is a found-footage film in the emerging style, whereby the characters conveniently all get headset cameras, explaining how they keep the action in shot, and there is another handheld camera to give a wobbly "third-person" position where needed. It's cheating a bit, and the question of how and in what circumstances this sensational footage has finally been edited together is fudged. Perdita Weeks plays Scarlett Marlowe, the cutely named historian-detective, archaeologist and occult semiotician investigating alchemy – a subject on which she solemnly takes the attitude of Dan Brown rather than Ben Jonson. What we're watching is supposedly a documentary filmed as she and other badass explorers descend into the forbidden parts of the Paris catacombs to find the legendary philosopher's stone, but whose sinister paths lead to a horrid personal hell. There are some interestingly contrived moments of claustrophobia and surreal lunacy, but this cliched and slightly hand-me-down script neither scares nor amuses very satisfyingly.