The Riddle of the Sphinx Inside No. 9 : Season 3 Episode 2
TV-MA BBC Two 30m
Aired: February 28th, 2017 @ 10:00 PM EST on BBC Two
Nina thinks Professor Squires has all the answers when actually, neither has a clue what the future holds. With deadly intent, they commence a battle of wits to solve the puzzle and reveal the guardian of their fate.
