Yes, the movie 'Orphan' was based on a real story. It's a very disturbing concept that was brought to the screen. The real - life events it was based on provided a foundation for the movie's complex and terrifying plot. By basing it on something real, the movie was able to tap into people's fears more effectively. It shows how something that may seem like an innocent adoption situation can turn into a nightmare scenario, much like what happened in the real - life case that inspired the movie.
The filmmakers likely took the core elements of the real story, such as the idea of a child with a hidden, disturbing nature, and built a fictional narrative around it. They might have exaggerated some aspects for dramatic effect. For example, Esther's actions in the movie are very extreme.