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- 1A Message from the Deep SeaSeptember 20, 1971
- 2The Missing Witness SensationSeptember 27, 1971
- 3The Affair of the Avalanche Bicycle & Tyre Co. Ltd.October 4, 1971
- 4The Duchess of Wiltshire's DiamondsOctober 11, 1971
- 5The Horse of the InvisibleOctober 18, 1971
- 6The Case of the Mirror of PortugalOctober 25, 1971
- 7Madame SaraNovember 1, 1971
- 8The Case of the Dixon TorpedoNovember 8, 1971
- 9The Woman in the Big HatNovember 15, 1971
- 10The Affair of the TortoiseNovember 22, 1971
- 11The Assyrian RejuvenatorNovember 29, 1971
- 12The Ripening RubiesDecember 2, 1971
- 13The Case of Laker, AbscondedDecember 9, 1971