For decades, authors and readers have been asking questions about what we would do, or change, if time travel existed—and what we could change. With romance, grand sci-fi epics and more, our picks for the best time travel books explore the kinds of opportunities, disasters and battles that time travel could create for us all. The Future of Another Timeline by Annalee NewitzTwo groups fight across timelines for the future of women’s and queer rights. Oxford student Kivrin sets out on a simple research project: travel back to the Middle Ages for an observational study. Torn between timelines, Kin refuses to let his daughter disappear, even if it means breaking every rule of time travel.