What is the initial incident of movie shawshank redemption?

In the movie "Shawshank Redemption," the initial incident is the wrongful conviction and imprisonment of the main character, Andy Dufresne. The story begins with Andy, a successful young banker, being falsely accused of murdering his wife and her lover. Despite his claims of innocence, he is found guilty and sentenced to life in prison at the Shawshank State Penitentiary. This sets off a series of events and character transformations that form the core of the movie's narrative.