No Exit (play)

Huis Clos, also known as No Exit, (AUDIO: The Keys of Baker Street) was a work of existentialism by Jean-Paul Sartre. (PROSE: Long Term) This play put forward the idea that hell was being trapped with other people, with the words and gazes of others "eat[ing] into your soul", as the Eighth Doctor put it. (AUDIO: The Keys of Baker Street)

When the Eighth Doctor came back through a time window at 107 Baker Street, noting there was "nothing to report, no exit", Helen Sinclair quipped, "and other plays by Sartre". The Doctor thought this play was brilliant. (AUDIO: The Keys of Baker Street)

The copy of Huis Clos in Abney's school library was filthy with grime. Abney was reading this copy of the book in the library when he was killed. (PROSE: Long Term)

Behind the scenes
Though Long Term doesn't give the English translation title, No Exit, The Keys of Baker Street has the Doctor give both titles, clearing up any potential confusion about these being separate works in the DWU.