Tortoise InvestigatesThe Gas ManEpisodes Episode guide

Back up to: Tortoise Investigates

1. 6. Devil's Breath

   Is the 40-year cat-and-mouse game nearly over?
2. 5. Truth Serum

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

   Chloe makes a startling discovery about another chemical trafficker.
4. 3. The Escape

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

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

   Special Agent Dennis Bass receives a tip-off that will change the course of his career.
7. Introducing... The Gas Man

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