"Ghost of a Clue" is the fourth episode of the animated series Bailey's Comets. It originally aired on CBS on September 29, 1973.
The race (which has been going on since the first episode) heads to London, and the place the teams are to be is Nottingham Castle. However, Bailey's Comets end up in another castle, where they meet the ghost of Sir Tremblelot, whose family coat of arms was stolen. The Comets help out, but the search intensifies when the other race teams get involved.