They do it with mirrors
Agatha Christie
Miss Marple (6)
Hercule Poirot's Casebook
Hercule Poirot Mystery (1)
All The Weyrs Of Pern
Anne McCaffrey
Dragonriders Of Pern (11)
The Hollow Queen
Elizabeth Haydon
The Broken Eye
Brent Weeks
Lightbringer (3)
The Blood Mirror
Lightbringer (4)