Demon Quest — Paul Magrs

The Doctor's return to Nest Cottage lands him in trouble when a key component from the TARDIS disappears. Mrs. Wibbsey is unwittingly responsible, having exchanged it for a bag containing four curious objects. It seems that each one is a clue, and the beginning of a chase through Time.

With the TARDIS not working properly, the Doctor and his housekeeper embark on a dangerous journey to Roman Sussex, nineteenth-century Paris, the snowy mountains of Eastern Europe, and 1970s New York. Along the way they collect their old friend Mike Yates, and together the trio face the elusive, demonic being who keeps luring them on in their quest. It soon becomes clear that a trap has been laid for the Doctor and a place reserved at his ultimate destination...