They do it with mirrors
Agatha Christie
Miss Marple (6)
HMS Ulysses
Alistair MacLean
The Change
K. A. Applegate
Animorphs (13)
Ticktock
Dean R. Koontz
The Annotated Pratchett File, v9.0
Terry Pratchett
Discworld Additional (1)
The L-Space Web: The Discworld Timeline