Palace of the Red Sun explained

Palace of the Red Sun
Author:Christopher Bulis
Series:Doctor Who book:
Past Doctor Adventures
Release Number:51
Subject:Featuring:
Sixth Doctor
Peri
Set In:Period between
Around The Mysterious Planet
Release Date:March 2002
Publisher:BBC Books
Pages:285
Isbn:0-563-53849-X
Preceded By:Drift
Followed By:Amorality Tale

Palace of the Red Sun is a BBC Books original novel written by Christopher Bulis and based on the long-running British science fiction television series Doctor Who. It features the Sixth Doctor and Peri.