They do it with mirrors
Agatha Christie
The Moving Finger
Three Act Tragedy
The Clocks
Death in the clouds
Ordeal by innocence
The Sittaford Mystery
Three Blind Mice
Elephants can remember
Death on the Nile: a Hercule Poirot mystery
The body in the library
Appointment with death: a Hercule Poirot mystery
Adventure of the Christmas Pudding and other stories
They came to Baghdad
Parker Pyne Investigates
The Murder of Roger Ackroyd: A Hercule Poirot Mystery
The seven dials mystery
Murder in the mews
Third girl
Murder Is Easy
Nemesis
The Big Four
Sparkling cyanide
Murder at the vicarage
Destination unknown
N Or M?
The murder on the links
Hercule Poirot's Christmas: A Holiday Mystery
Murder in Mesopotamia: A Hercule Poirot Mystery
Evil under the sun: a Hercule Poirot mystery