Powerstone (short story)

Powerstone was a short story published in the K9 Annual 1983. It featured Sarah Jane Smith and K9 Mark III.

Summary
to be added

Characters

 * Sarah Jane Smith
 * K9 Mark III
 * Brendan Richards
 * Lavinia Smith
 * Toby Gough
 * Professor Clay
 * a coven of witches

Continuity
to be added