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- 1The Mysterious Death on the Underground RailwayJanuary 29, 1973
- 2Five Hundred CaratsFebruary 5, 1973
- 3Cell 13February 12, 1973
- 4The Secret of the ManifiqueFebruary 19, 1973
- 5The Absent-Minded CoterieFebruary 26, 1973
- 6The Sensible Action of Lieutenant HolstMarch 4, 1973
- 7The Superfluous FingerMarch 11, 1973
- 8Anonymous LettersMarch 19, 1973
- 9The Moabite CypherMarch 26, 1973
- 10The Secret of the FoxhunterApril 2, 1973
- 11The Looting of the Specie RoomApril 9, 1973
- 12The Mystery of the Amber BeadsApril 16, 1973
- 13The Missing Q.C'sMay 7, 1973