Sea of Tranquility by Emily St. John Mandel is both a journey through time and a mediation on the nature of time. Best known for her stunningly prescient pandemic novel Station Eleven, Mandel writes in Sea of Tranquility about the resonance of shared experiences between characters living worlds apart. In 1912, a young British man is banished to Canada and has a bizarre, otherworldly hallucination in the middle of a forest in Vancouver. This vision is also shared by Olive Llewelyn, a writer from 2203 who is traveling between a moon colony and Earth, which has just been hit by another pandemic. What’s the meaning of this vision and why does it occur across time and space? The novel unspools in tightly plotted, enthralling episodes that ultimately answer the book’s many questions.