Dr Who encounters one of the most notorious characters from the past, as he journeys through time to solve the great Historical Mysteries...
Not surprisingly the Doctor becomes mixed up with Richard the third himself, as he tries to unravel the perplexing problem of who exactly killed the Princes in the Tower.
Peri and Erimem also encounter a suspicious time traveller. Someone from the Doctor's own past. Someone who shouldn't really be there at all.
So who did murder the Princes in the Tower? Perhaps it's best not to ask a question like that.
You might not like the answer...
This story takes place between "Planet of Fire" and "The Caves of Androzani".
The Doctor: Peter Davison
Peri: Nicola Bryant
Erimem: Caroline Morris
Clarrie: Arthur Smith
Mr Seyton: Michael Fenton-Stevens
Richard, Duke of Gloucester: Stephen Beckett
Henry, Duke of Buckingham: Marcus Hutton
Earl Rivers: John Culshaw
Sir James Tyrell: Chris Neill
Susan: Katie Wimpenny
Judith: Linzi Matthews