summary of the butterfly effect

Evan, a child that has lost some moments in his life because an illness, had a dificult childhood because of terrifying events that involved his friends kayleigh, lenny and tommy and he could not remember

During his childhood he had a diary where he wrote all details of his life. When he grew up and went in the college he read one of his journals and inexplicably he went to his own past, remembering those crucial moments that he had forgoten. He realized that he could return to his own past and change his friends and his own life, particulary with keyleigh, his first love.

Evan travel back in time and tried to change things, but when he changed something, when he return he had a different life. That change had unexpected and disastrous consequences. When trying to change something to have a happy life with kayleight, he made his life worse.

This happens until he stops writing those diaries because people thought that he was crazy. So, one day, he watched some old movies of his childhood and everything changed. Having changed that, he never got to meet his friends, and those horribles things never took place. This strange illness in his head was called the butterfly effect, and it was hereditary.