This anime series is centred on Heizou Hasegawa; the head of the Arson Thief Control Office in the city of Edo (historical Tokyo). Each episode sees him taking on a different case, along with his team. The antagonists tend to be a murderous bunch; quite happy to kill anybody who gets in their way or may be a witness.
I really enjoyed this series. The individual stories are intriguing and the look does a great job of capturing the era... or at least what I imagine it was like. While Heizou Hasegawa is clearly the hero of the show he isn't perfect by modern standards; using methods of the time that would be unacceptable now... something I approve of as, as I don't think the past can be judged by current standards. While the cases are important we also get an insight into Heizou's private life and some looks at his past. It is violent at times, expect severed limbs and some torture, but that is justified by the stories. Overall I'd certainly recommend this to older anime fans.
These comments are based on watching the series in Japanese with English subtitles.