Extremis

"Extremis" is the sixth episode of the tenth series of the British science fiction television series Doctor Who. It was written by Steven Moffat and broadcast on 20 May 2017 on BBC One. "Extremis" received extremely positive reviews from television critics, with many praising Peter Capaldi's performance and Steven Moffat's script, though some commented on the complexity of the script.

The Vatican calls upon the Doctor (Peter Capaldi) to investigate the Veritas, a book whose readers typically kill themselves after reading it. When the Veritas is translated and leaked online, the Doctor must uncover the dark secret that the book holds. It is the first of three loosely connected episodes called "The Monks Trilogy".