The book was heavily promoted upon publication in 1950 as being Christie's fiftieth book, although in truth this figure could only be arrived at by counting in both UK and US short story collections.
Buku tersebut sangat dipromosikan setelah diterbitkan pada 1950 sebagai buku kelima puluh Christie, meskipun pada kenyataannya angka tersebut hanya datang dengan penghitungan kumpulan cerpen Inggris dan AS.