An old story of dead ambassadors

It goes something like this:

The legendary diplomat Talleyrand was once awoken by one of his aides. “The Russian ambassador has died in his sleep!” the young man exclaimed.
Talleyrand sat up and thought for a moment.
“Hm. I wonder what his motive for doing that was.”
It’s probably apocryphal, but the lesson is one all of us writers, [...]