'Bridgerton' just made its boldest book change yet — but how will it play out on the show?

• Francesca Bridgerton marries John Stirling, the Earl of Kilmartin, in "Bridgerton" season three.
• But the show makes a major creative choice at the end of the season that will deeply affect her story.
• It still remains to be seen how "Bridgerton" will handle it — but it will require some maneuvering.

Warning: Major spoilers ahead for "Brigerton" season three and the book "When He Was Wicked."