Not only does the novel return the characters to the setting of her first, The Mysterious Affair at Styles, but it reunites Poirot and Hastings, who last appeared together in Dumb Witness in 1937.
Novel tersebut tak hanya mengembalikan para karakternya pada latar The Mysterious Affair at Styles, namun menyatukan kembali Poirot dan Hastings, yang terakhir muncul bersama dalam Dumb Witness pada 1937.