It's hard to say for sure. The act might have some roots in reality, or it could be a total work of imagination. You'd have to do some research or ask the creator to know for sure.
Well, typically 'The Disappearing Act' is fictional. Authors often come up with such plots to engage readers and take them on an imaginative journey. It's not based on real events.
Well, it depends. Sometimes what seems like an act of vengeance in a story could be inspired by real-life incidents, but the details and circumstances might be changed or embellished to make it more engaging. There's no straightforward yes or no answer.