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Tortoise InvestigatesThe Gas ManEpisodes

    6. Devil's Breath

    Is the 40-year cat-and-mouse game nearly over?

    5. Truth Serum

    What happened to The Gas Man when he arrived back in Germany as a fugitive?

    4. The Other Gas Man

    Chloe makes a startling discovery about another chemical trafficker.

    3. The Escape

    The team persuades The Gas Man to step out from the shadows.

    2. The Sting

    Special Agent Bass concocts a plan to reach the Gas Man.

    1. The Special Agent

    Special Agent Dennis Bass receives a tip-off that will change the course of his career.

    Introducing... The Gas Man

    In the late 1980s, Agent Bass is tipped off about a shipment of suspicious chemicals.