Just in time for Halloween, Sean Mathias brings to London what should be a surefire hit while everyone's looking for something spooky, although whether it can sustain that for the rest of its run to March will have to remain to be seen. John Pielmeier adapts William Peter Blatty's book - although William Friedkin's film is at least as much, if not more of an inspiration. Actress and single mother Chris (Jenny Seagrove) is put up in an old Georgetown house while on location for her latest film. Her daughter Regan (Clare Louise Connolly) has just celebrated her 12th birthday (give or take a couple of decades,) and her absent father has forgotten it for the second year running, so she's vulnerable to any father substitute who might be on offer. So when the disembodied voice of Gandalf starts talking to her in the attic she agrees to play a game with him - one which results in the demon "Captain Howdy" taking up residence in the girl's body and terrorising her family and friends.