Moat Farm Murder, The

I don't see the complete plot summary in your message. You've provided the opening line about a drama based on Mr. Dougall's murder confession, but the rest appears to be cut off. Could you please share the full plot summary you'd like me to rewrite? Once you provide the complete text, I'll be happy to rewrite it in my own words while keeping the meaning the same, using simple English and PG-rated American language.