The project submitted as the writer and director's final thesis for the Master's Degree in Screenwriting at the International University of Valencia was approved with an outstanding grade. Below, the asbtrat of the paper. Abstrat This Master's Thesis delves deeply into the cinematic genre of based-on-true-events films. It analyzes the different nature, tools, and approaches used in crafting screenplays aimed to capture the essence of historical events and real-life experience