Scotland Yard investigates some occulty shenanigans in this vampire film that doesn't have many vampires in it. There's espionage, various dossiers, microfilm, spy watches, secret recorders, motorcycle chases, and petri dishes filled with a new strain of bubonic plague. There's a pentagrammy bit of sorcery involving a blonde naked chick and a chicken, and if you really like that sort of thing you'll see that exact scene repeated several times. What all that has to do with Dracula, I don't really know. About forty minutes later the vampires finally appear, and it's a scene comprised of a basement filled with chained vampire chicks and extremely brief lesbian subtext.
After that the movie switches gears and resembles a vampire movie as best it can, with Peter Cushing playing Van Helsing and Christopher Lee playing Dracula, but it's too little, too late.