When I first readMy Sister’s Keeper, I was devastated.
The whole family struggles with the fact that if Anna stops her treatments, Kate will die.
The book grapples with big questions about medical ethics and family responsibilities.

Abigail Breslin and Cameron Diaz in ‘My Sister’s Keeper’.Credit: Everett Collection
But drastically changing the ending of a story is beyond the pale.
Just think if this becomes commonplace.
What if studio heads thought they knew best about everything (Ha!

‘My Sister’s Keeper’ stars Abigail Breslin and Cameron Diaz.
), and regularly changed beloved book plot points that they thought would be hard to sell?
What if Lisbeth Salander became more upbeat?
What if Dumbledore didn’t die in theHarry Potterfilms because everyone really liked him?
What if inDear John, John and Savannah had a Hollywood ending and would up together after all?
(Oh, wait.)
Learn from theMy Sister’s Keeperdisaster.
In cases of big endings,stick to the damn book.