UNIT is called in when an important diplomat is attacked in his own home - by a man who then vanishes into thin air. The Doctor and Jo spend a night in the 'haunted' house and meet the attackers - who have time-jumped back from the 22nd century in the hope of changing history.
Travelling forward in time, the Doctor and Jo find themselves trapped in a future world where humans are slaves and the Daleks have already invaded. Using their ape-like servants to Ogrons to maintain order, the Daleks are now the masters of Earth.
As the Doctor desperately works to discover what has happened to put history off-track, the Daleks plan a time-jump attack on the 20th century.
This novel is based on a Doctor Who story which was originally broadcast from 1 to 22 January 1972.
Featuring the Third Doctor as played by Jon Pertwee, with his companion Jo Grant and the UNIT organisation commanded by Brigadier Lethbridge-Stewart
Terrance Dicks worked on scripts for The Avengers as well as other series before becoming Assistant, and later full Script Editor of Doctor Who from 1968. Dicks worked on the entirety of the Jon Pertwee Third Doctor era of the programme, and returned as a writer - scripting Tom Baker's first story as the Fourth Doctor: 'Robot'. His later script writing credits on Doctor Who included the 20th anniversary story 'The Five Doctors'. Terrance Dicks novelised many of the original Doctor Who stories for Target books, and has written original Doctor Who novels for BBC Books. Louis Marks, original script writer of 'Day of the Daleks', worked as a television script writer and editor all through the 1960s - writing the 1964 Doctor Who adventure 'Planet of Giants' for the very first TARDIS crew - before joining the BBC as a Script Editor in 1970. It was while at the BBC that Louis Marks wrote the original scripts for 'Day of the Daleks', later adapting them to add the Daleks as the villains. Marks wrote two further stories for the series - both featuring the Fourth Doctor: 'Planet of Evil' and 'The Masque of Mandragora'. He went on to become a highly-respected television producer working for the BBC. Louis Marks died in September 2010.