Set in a war‑ridden reinterpretation of 1914, Leviathan tracks Alek, a runaway prince from the Austro‑Hungarian realm, alongside Deryn Sharp, a bold girl who masquerades as a boy to enlist in the British Air Service. When destiny unites them aboard HMS Leviathan, an enormous living airship constructed from genetically engineered beings, they set off on a globe‑shifting quest that will upend all their notions of conflict, fidelity, and self today.