The initial seed for this story came courtesy of a one volume history of the Ottoman Empire that I devoured late last year. (Well, not really devoured. More like enjoyed a seven course meal at a relatively sedate pace with plenty of breaks in between.) In the midst of making my way through this, I read an account of a Sultan who came to power and locked his brother away, but the world turned and times changed and then suddenly he was being overthrown and executed and they needed a new Sultan.
Except, when they went to knock on the door where his brother was being kept, he didn't believe them. He absolutely refused to believe them, thinking that he was going to be taken away and executed (which was a perfectly reasonable fear in those days, Sultans weren't exactly crazy about leaving potential rivals to their thrones out there) and they had to actually come in and drag him out and take him away to be crowned.
The idea sort of flowed from there and eventually became, "The Door"
(You can either click on the link above, or here's the full link: https://medium.com/@thequixoter/the-door-17c233e0a84 )
Hope you enjoy reading it as much as I enjoyed writing it!