Anna and Omeir, on opposite sides of the formidable city wall during the 1453 siege of Constantinople; teenage idealist Seymour and gentle octogenarian Zeno, in an attack on a public library in present day Idaho; and Konstance, on an interstellar ship bound for a distant exoplanet, decades from now. A single copy of an ancient text provides solace, mystery and the most profound human connection to these five unforgettable characters. Spectacular new novel from the author of 'All the Light We Cannot See'.