A steampunk war where the biggest weapons are living, breathing creatures, not machines bolted together by engineers. Two kids on opposite sides of a dying empire discover the real enemy isn't the other nation, it's the old men who profit from sending them to die. The HMS Leviathan itself becomes a character that forces them to choose between the world they were born into and the one they actually want to live in.
A runaway prince fleeing across a fractured Europe and a girl masquerading as a soldier find themselves thrown together on humanity's greatest weapon: the HMS Leviathan, a colossal airship built from living, genetically engineered tissue. As the Austro-Hungarian heir and British Air Service recruit, Alek and Deryn should be enemies, but survival aboard this breathing, biomechanical beast forces an unlikely alliance. The Leviathan itself becomes both character and setting, a magnificent creature that demands respect and constant vigilance. Around them, a reimagined 1914 unfolds where nations wage war with biotechnology instead of traditional machines, where loyalty carries lethal weight, and where identities are weapons as dangerous as cannons. What begins as a desperate escape transforms into something larger. Alek and Deryn must navigate shifting allegiances, their own conflicting beliefs, and the terrifying question of whether the Leviathan truly serves humanity or hunts its own masters. Packed with aerial combat, political intrigue, and a friendship forged in impossible circumstances, this adventure pulls you into a war that rewrites history itself.