Instruments of Darkness is a BBC Books original novel written by Gary Russell and based on the long-running British science fiction television series Doctor Who. It features the Sixth Doctor and Mel.

Instruments of Darkness

Author	Gary Russell
Series	Doctor Who book: Past Doctor Adventures
Release number	48
Subject	Featuring: Sixth Doctor Mel and Evelyn Smythe.
Set in	Period between The Trial of a Time Lord and Time and the Rani
Publisher	BBC Books
Publication date	November 2001
Pages	287
ISBN	0-563-53828-7
Preceded by	Dying in the Sun
Followed by	Relative Dementias

This novel concludes a trilogy concerning the Pale Man and the Irish Twins which began in Russell's The Scales of Injustice and Business Unusual. Evelyn Smythe, the Sixth Doctor's companion from the Big Finish Productions audio plays, also appears.