The term "story line" refers to the sequence of events that take place in a book, movie, play, or any other narrative. If you're looking for synonyms for this term, there are several options available. "Plot" is perhaps the most commonly used synonym for "story line," referring to the basic events that make up the narrative. "Narrative" itself can be used as a synonym, indicating the overall story being told. "Arc" is a more specific synonym, referring to the overall trajectory of the plot. "Throughline" is another option, pointing to the thread that runs through the entire narrative. Ultimately, the choice of synonym may depend on the context and tone of the writing.