Angela Landsbury makes a brief appearance and then disappears. We are left with the character of Dennis Stanton, insurance investigator. Even with Keith Michell and Roy Dotrice, the story falls flat. It revolves around a forged manuscript, allegedly written by Mark Twain, (ridiculously entitled 'Wild, wicked wench'). The manuscript is authenticated and on display, about to go on auction when it's conveniently destroyed by a fire. Dennis Stanton (Michell) investigates since it's his company that insured the manuscript for 5 million.
I don't know if Angela Landsbury had to be absent for another commitment or they were trying to create a spin-off. But it doesn't work.