Orphaned by the Border Wars, Alina Starkov is taken from obscurity and her only friend, Mal, to become the protege of the mysterious Darkling, who trains her to join the magical elite in the belief that she is the Sun Summoner, who can destroy the monsters of the Fold.

The behemoth is the fiercest creature in the British Navy. It can swallow enemy battleships with one bite. The Darwinists will need it, now that they are at war with the Clanker Powers. Deryn is a girl posing as a boy in the British Air Service, and Alek is the heir to an empire posing as a commoner. Finally together aboard the airship Leviathan, they hope to bring the war to a halt. But when disaster strikes the Leviathan's peacekeeping mission,...

Dusk, the world's first bat, must lead his colony to safety in a time of changing species.

Illustrations and text provide detailed looks at the machines, uniforms, creatures, and characters of the Leviathan book series.

Alek and Deryn encounter obstacles on the last leg of their round-the-world quest to end World War I, reclaim Alek's throne as prince of Austria, and finally fall in love.

Continues the story of Austrian Prince Alek who, in an alternate 1914 Europe, eludes the Germans by traveling in the Leviathan to Constantinople, where he faces a whole new kind of genetically engineered warships.