Watch the PuppetMaster. Mental true crime. really good.
I love documentaries and dramas about that sort of thing.
Interestingly, there was also a drama mini-series made about this, called Rogue Agent, starring James Norton, that you can watch on - I want to say ITVX, but it might be one of the other "terrestrial" channel based streaming services.
I quite enjoyed it, although the "some characters and scenes have been invented for purposes of dramatisation" was writ large for me, because it ripped, in its entirety, a scene from an entirely fictional novel I had recently read before seeing this drama.
So now I take any "based on a true story" drama with about the Atlantic Ocean's amount of salt as a result.
Interestingly, there was a completely fictional drama made of the fictional novel in question a few years earlier, I don't know whether it included the scene that Rogue Agent nicked from the novel because I haven't seen it - but now I am going to see if I can find it!
(For info:
The documentary about the Robert Freegard con was called The Puppetmaster: Hunting the Ultimate Conman
The drama with James Norton about the Robert Freegard con was called Rogue Agent
The fiction novel that the above drama ripped an entire scene from was called Apple Tree Yard, by Louise Doughty
The actual drama of the novel was also called Apple Tree Yard.
The scene that was nicked was the one that occurs in the lighthouse at Trinity Buoy Wharf, and it stuck out in my mind because I live near there and go there often - I've even organised 2 Urban walks that feature the landmark).
ETA: I clearly spend way too much time watching telly.