In the ancient city of Nineveh, on the bank of the River Tigris, King Ashurbanipal of Mesopotamia, erudite but ruthless, built a great library that would crumble with the end of his reign. From its ruins, however, emerged a poem, the Epic of Gilgamesh, that would infuse the existence of two rivers and bind together three lives. In 1840 London, Arthur is born beside the stinking, sewage-filled River Thames. With an abusive, alcoholic father and a mentally ill mother, Arthur’s only chance of escaping destitution is his brilliant memory. When his gift earns him a spot as an apprentice at a leading publisher, Arthur’s world opens up far beyond the slums, and one book in particular catches his interest: Nineveh and Its Remains. In 2014 Turkey, Narin, a ten-year-old Yazidi girl, is diagnosed with a rare disorder that will soon cause her to go deaf. Before that happens, her grandmother is determined to baptize her in a sacred Iraqi temple. But with the rising presence of ISIS and the destruction of the family’s ancestral lands along the Tigris, Narin is running out of time.