The Witchmaster's Key
![The Witchmaster's Key](data/ebooks/pics/hbms55.jpg)
Plot summary
The Hardy boys' investigation of a museum and grave robbery in Griffinmoore, East Anglia arouses the anger of a coven of black witches.
- Publication date: 1976
- Ghostwriter: Vincent Buranelli
- Summary: In the British Isles to investigate a robbery, the boys must contend with a coven of witches.