Already ever since the first episode turned out terrific, I've been waiting for the "Supernatural"-team to do an episode set in an old-fashioned mental asylum, as they form the absolute greatest location to enact a creepy and atmospheric horror story! Luckily I didn't even had to wait that long, since installment n° 10 takes Sam & Dean to a little town in Illinois where mysterious things are going on in the closed down and abandoned Roosevelt sanitarium. Following a strange mobile text message from their father, which causes some disagreement between the two brothers, they investigate the case of a police officer who killed his wife and then committed suicide after having set foot in the asylum. It is said that the former patients' restless spirits still wander around in the dark corridors and drive to insanity everyone who dares to spend the night. Sam & Dean discover that the walls of the asylum are hiding far darker secrets, as the old head doctor subjected the patients to all kinds of crazed medical experiments. The asylum setting is outstanding and instantly reminded me of all the sinister madhouses used in old-fashioned British horror productions, like "Dark Places" and "Don't Look in the Basement". The script even provides the asylum with a typically delightful albeit a little clichéd background including deadly riots and medical staff members that are far more deranged than the actual patients. "Asylum" is a downright splendid entry in the even more splendid "Supernatural" series that, as confirmed by the other reviewers around here, only gets better with each episode. There are a handful of extremely efficient jump-moments in the script and the special effects are creepy and convincing, as always. Each episode also contains more and more references towards older horror classic, which is surely something the fans of the genre appreciate. Dean particularly seems to be fond of Jack Nicholson in "The Shining" and "One Flew Over The Cuckoo's Nest" in this episode, while Sam mentions "The Amityville Horror".