While far from his best work, The Blind Barber (1934) by John Dickson Carr does contain the brilliant problem of a corpse appearing on a passenger liner mid-voyage with no passenger or crew member apparently having died to provide it. Ella Risbridger’s juvenile mystery debut The Secret Detectives (2021) works from the same principle, with 11 year-old Isobel Petty seeing someone thrown overboard one stormy night…and yet the next morning no-one is missing.
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