'Wolfsbane', written by Jacqueline Rayner, features the Fourth Doctor, Eighth Doctor, Sarah and Harry.
Back Cover Blurb
Died 28 November 1936
Deliver us from Evil
Harry is dead. having left him abandoned and alone in pre-war Britain, the Doctor and Sarah try to solve the mystery of his death. But the only witness is in a lunatic asylum, driven mad by what he has seen. He tells of murder and mutilation, of living trees and lon-dead legends, of wolfmen and war… And of a mysterious stranger known only as the Doctor.
Can it be true that Harry Discovered the last resting place of the Holy Grail? Why are the flowers and trees in a Somerset village in full bloom at Christmas? And is it just a coincidence that Harry died under a full moon…?