Towards zero
Agatha Christie
Superintendent Battle (5)
The Memory of Earth
Orson Scott Card
Homecoming (1)
The Ecolitan Operation
L.E. Modesitt
Ecolitan Matter (1)
A Blink of the Screen
Terry Pratchett
By the pricking of my thumbs
Tommy and Tuppence (4)
Partners in crime
Tommy and Tuppence (2)
N Or M?
Tommy and Tuppence (3)
The secret adversary
Tommy and Tuppence (1)