With no rhyme or reason, people start to lose their memories. For some, it happens in a snap, all at once. For others, it's a slow fade. They forget the name of their third-grade teacher. They forget to show up to their best friend's wedding. Eventually they forget themselves, and everything that makes them who they are. This is the world Emma (Olivia Cooke) and Jude (Jack O’Connell) find themselves in not long after meeting and falling in love. After the devastating realization that Jude has contracted the disease that will eventually wipe his memory, the young couple will try anything to keep themselves from forgetting the love they share. (Contains sequences involving strobe lighting which may trigger a seizure in those with photosensitivity epilepsy.)