|Hot babysitter Sydney (Tess Atkins) is a key witness in Thin Lizzie's murder mystery|
The unstoppable march of Supernatural's Season Eleven continues with yet another blockbuster episode. Thin Lizzie is a stellar bait-and-switch tale that kicks off as a "monster-of-the-week" ghost story, but quickly veers off into very different territory.
The Winchesters investigate a double murder at the former home of famous axe murderer Lizzie Borden, now a guest house and museum, suspecting Lizzie's ghost as the culprit.
However, they soon realise that the house is one big hoax and begin to wonder if the killer is more human than paranormal.
Bodies continue to drop and the brothers' inquiries lead them to Len (Jared Gertner), a Lizzie Borden "superfan", who recounts a strange encounter with a young girl in the grounds of Lizzie Borden's house.
With the preconception that Thin Lizzie was going to a ghost story - possibly Supernatural's forte when it comes to classic "monsters" - I was already feeling confident about this episode, but once Sam and Dean discovered that the "haunted house" they were investigating was rigged up to sucker naive ghosthunters and paying guests my interest was further piqued.
I thought I'd sussed out the murderer's identity, but again I'd been caught out by the sly misdirection of Nancy Won's script.
The mystery deepened even once its connection to the season's main arc was revealed, until eventually - by process of elimination - the true killer was revealed.
While not really known as a "murder mystery show", it's been a long while since an episode of Supernatural so cleverly masked the identity of its antagonist.
Supernatural continues to build on the lessons learned from 10 previous seasons, but can this season continue to deliver such high calibre material?