I'm not entirely sure which 'Edgar' you are referring to specifically. There could be many works named Edgar that are based on a true story. It could be about a person named Edgar and his real - life experiences that the story is centered around.
Well, if 'Edgar based on a true story' is a movie, for example, it could be about a person named Edgar who had some extraordinary experiences in real life. Maybe he was involved in a historical event, like a war or a social movement. Or perhaps it's about his personal journey, such as overcoming difficulties in his family or career. However, since we don't have more details, this is just speculation.
It depends. Sometimes stories labeled as 'true' have elements of embellishment or interpretation. Without specific details about Edgar, it's hard to say for sure.