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The RivalsSeries 4Episodes

  1. Today17:30
    BBC Radio 4 Extra

    4. The Mystery of the Scarlet Thread

    4/4Inspector Lestrade introduces Sherlock Holmes' rival Prof SFX Van Duson.

  2. Tomorrow01:30
    BBC Radio 4 Extra

    4. The Mystery of the Scarlet Thread

    4/4Inspector Lestrade introduces Sherlock Holmes' rival Prof SFX Van Duson.