Agatha Christie
Double Sin

Dodd Mead, New York, 1961

Link

1. Wikipedia: Double Sin and Other Stories

Double Sin

see "Poirot's Early Cases"

Wasp's Nest

see "Poirot's Early Cases"

Theft of the Royal Ruby

="The Adventure of the Christmas Pudding".
see "The Adventure of the Christmas Pudding"

The Dressmaker's Doll

see "Miss Marple's Final Cases"

Greenshaw's Folly

see "The Adventure of the Christmas Pudding"

Double Clue

see "Poirot's Early Cases"

The Last Seance

see "The Hound of Death"

Sanctuary

see "Miss Marple's Final Cases"