The 2010s were a pretty major time for dystopian-novel-to-movie adaptations, and this movie based on the novel by Meg Rosoff is no exception. "How I Live Now" tells the story of American teenager Daisy (Saoirse Ronan), who reunites with her British cousins during an apocalyptic nuclear war. Not only did the cast in the film go on to become big names — does Tom Holland ring a bell? — but the romantic chemistry between Saoirse Ronan and her eldest cousin rivals Katniss and Peeta's. (OK, so it's her cousin, but it's also practically the end of the world.)