Lina and her father have arrived at an enclave called the Sea, a staging-post between migrations, with only a few possessions, among them three volumes from The Great Voyagers encyclopedia series. In this mysterious and shape-shifting building made of time, pasts and futures collide. Lina befriends her neighbours: Bento, a Jewish scholar in seventeenth-century Amsterdam, excommunicated for his radical thought; Blucher, a philosopher in 1930s Germany fleeing Nazi persecution; and Jupiter, a poet of Tang Dynasty China, whose brilliance goes unrecognised by the state. Their stories fuse with those of philosophers from previous centuries: Baruch Spinoza, Hannah Arendt and the Chinese poet Du Fu. And as Lina’s ailing father becomes less well, he recounts how he and Lina came to reside in the Sea, and what his betrayals cost their family and others.