Theodore Finch is fascinated by the idea of death and constantly comes up with more and more sophisticated ways to end his life - but something again and again prevents him from turning his plans into reality. Violet Markey lives in the future, counting the days until graduation, when she will finally be able to leave her hometown, where everything reminds her of her sister’s death. When Finch accidentally meets Violet at the top of the school bell tower, it is he who saves her from suicide and decides to teach the girl, immersed in pain and memories, to live again, hope and enjoy every new day. But he can can he, by saving another, save himself?