The unique part is its main character. He is not just a typical assassin. He has his own code of ethics that sets him apart from others in his line of work.
A unique setting can make it stand out. For example, if the assassin operates in a world with a strange magic system or a very different historical period.
It depends on various factors. Some people are really into assassin novels because they offer a different kind of hero or anti - hero. If 'worlds finest assassin novel' has a great narrative that explores the character's journey, motives, and the world they operate in, it could gain a following. Also, if it manages to stand out from the crowd of other assassin - themed books with its own unique style, it has a good chance of being popular.
It is indeed a true story. The movie depicts an actual incident where people showed remarkable courage and determination in the face of extreme circumstances. The characters and events are drawn from real history.
It sure is. The story of 'Their Finest' takes cues from actual occurrences and weaves them into a compelling fictional tale. Some characters and situations might be fictionalized for dramatic effect, but there's a solid foundation of truth at its core.