Yes, 'Casablanca' is based on a play called 'Everybody Comes to Rick's' which could be considered a form of a novel - like work. The story had a lot of the elements that were later translated into the iconic movie we know today.
The movie 'Casablanca' is based on the play 'Everybody Comes to Rick's'. The play was rich in character development and plot twists, much like the movie. For example, the character of Rick in the movie was also a central figure in the play, with his complex past and relationships. The story's setting in Casablanca was also there in the play, which added to the allure and mystery of the whole story.
Casablanca is not based on a true story. It was written as a fictional drama to capture the mood and tensions of that era. The characters and plot were created for the film and don't have real-life counterparts.
It could mean that like a Casablanca night, which is often associated with a certain melancholy and mystery, the end of the love story was filled with a sense of unresolved emotions. Just as the city has an air of secrecy at night, the end of the love might have left things unsaid or feelings lingering.
I'm not sure specifically as I haven't read it. But it could have characters like a hero who is trying to navigate the complex world of Casablanca, perhaps a detective or a traveler.