The Vow has roots in true events, but it's not a strictly 100% accurate portrayal. Filmmakers often blend reality with imagination to create a compelling story on the screen.
In 'The Count of Monte Cristo', Edmond Dantes makes a vow of revenge against those who wronged him. This vow drives the entire plot as he painstakingly plans his retaliation.
Well, without more context, it's hard to be very specific. Generally, it could mean a vow or a promise that is created within the framework of a novel. It might be a vow made by a character in the story, which could drive the plot forward, like a vow of revenge or a vow of love.
Yes, 'The Vow' book is based on a true story. It often delves into real - life experiences and relationships that are then adapted into a narrative for the book.