A foggy night a lonely country house and a woman with a gun in her hand quietly surveying the dead body of her husband.
It looked like a straightforward case of murder.
Or was it? As the ghosts of an old wrong begin to emerge from the past, the case begins to look anything but straightforward.
First staged at the Duchess Theatre in London in 1958, this play ran for 604 performances, and is as gripping and ingenious as you would expect from the Queen of Crime.
"The Pale Horse" - Father Gorman is called to a dingy rooming house to see a woman who, before she dies, confesses a bizarre tale to him.
Leaving the house he is followed and, in the fog, a fatal blow is struck.
A piece of paper with nine names written on it is found in the dead priest's shoe.
The clue leads to The Pale Horse Inn, home of three women: a psychic, a medium and a witch.
Can Mark Easterbrook and his friend Ariadne Oliver, unravel the occult mysteries?