Tom becomes the guinea pig in an investigation which leads him, and the research team, to a house where they find more than they bargained for.

The sudden death of two friends involves Tom with a botanical research unit on a lonely island.

A secret military exercise that ends in disaster, frightened villagers and his brother found wandering on a hillside sends Tom in search of an old enemy.

A group of students and an ouija board involves Tom in a situation which has terrifying consequences.

Tom Crane goes to Edinburgh in search of an occult practitioner, only to find himself in the centre of the devious schemes of others.

Tom begins to have doubts about Julia's death. Is she still working for the department or is someone out to get him?

Anne leaves Edinburgh and Tom sets out alone to find her, but there are several other interested parties behind him.

Dr Karl Bruckner has been brought over from East Germany to work for the department and finds himself in the centre of a power struggle.

A boy is suspended from school for vandalism. When the boy shows he has abilities that could have destructive consequences, Martindale becomes interested. So does someone else.

Michael has been discharged from hospital but seems to be suffering from strange dreams. Tom confides his fears to Scott-Erskine.