Did this 1928 crime novel predict a 2019 high court case?

A family must prove whose parent died first in an extraordinary inheritance battle.
That was the situation at the high court this week, which resolved a dispute between two sparring stepsisters.
But it is also the plot of Dorothy L Sayer’s much-loved 1928 novel The Unpleasantness at the Bellona Club.
So how did the Mistress of Crime come to predict today’s court battles nearly a century ago?
Jenni Murray asks Seona Ford, Chairman of the Dorothy L Sayers Society and author Jill Paton Walsh on Woman's Hour.