Inside No. 9 (2014– )
5 user 3 critic

The Riddle of the Sphinx 

A professor at the University of Cambridge attempts to teach a student how to solve a cryptic crossword.


Guillem Morales




Episode cast overview:
Alexandra Roach ... Nina
Steve Pemberton ... Squires
Reece Shearsmith ... Tyler


One night Professor Squires, who compiles crosswords under the name of Sphinx, is visited by Nina, with an initial request, to beat her boyfriend Simon at solving his next puzzle They bond as they solve clues together but Squires discovers that Nina has an ulterior motive - revenge following a contest which resulted in the death of a loved one. Squires brings in his friend Tyler, to explain matters, but he too is seeking revenge, regarding a past incident in all their lives. Written by don @ minifie-1

Plot Summary | Add Synopsis


Comedy | Drama | Horror


TV-MA | See all certifications »






Release Date:

28 February 2017 (UK) See more »

Company Credits

Production Co:

BBC Comedy See more »
Show more on IMDbPro »

Technical Specs


Sound Mix:



See full technical specs »

Did You Know?


The "Anton" referred to towards the end of the episode is Anton Checkhov, who did indeed write several versions of the quote "never introduce a gun on stage unless you intend to use it". His most famous female creation is arguably Nina in The Seagull - the female character here is called Nina - both come to a bad end. See more »


References The Silence of the Lambs (1991) See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

The Riddle of the Sphinx
28 September 2017 | by Prismark10See all my reviews

A very cryptic episode as the clues reveal themselves thick and fast as the show goes on. If you ever found crosswords difficult to do then this is the programme for you as it unravels the thinking behind the cryptic crosswords.

A University of Cambridge professor's rooms are broken in by a young lady who works in a bakery, all she wants to do is to prove how smart she is to her boyfriend.

The professor plays along and the lady proves rather adept in cracking the puzzles but there is something rather fishy going on.

An enjoyable fiendish instalment, there is even a Chekhov gun quip. Pemberton and Shearsmith have to be admired by the way they have constructed the episode.

6 of 6 people found this review helpful.  Was this review helpful to you? | Report this
Review this title | See all 5 user reviews »

Contribute to This Page

Free Movies and TV Shows You Can Watch Now

On IMDb TV, you can catch Hollywood hits and popular TV series at no cost. Select any poster below to play the movie, totally free!

Browse free movies and TV series

Stream Trending Movies With Prime Video

Enjoy a night in with these popular movies available to stream now with Prime Video.

Start your free trial

Recently Viewed