Launching a planned four-book series, Westerfeld (the Uglies series) explores an alternate 1914 divided between Darwinists, who advocate advanced biotechnology, and Clankers, masters of retrofuturistic mechanical engineering. Austria-Hungary's Prince Aleksandar is whisked away into the night by trusted advisers; he soon learns that his parents, Archduke Franz Ferdinand and Countess Sophie, have been murdered and that he has been targeted by prowar Germans. Half a continent away, Deryn Sharp successfully passes as a young man to join the British Air Service; her bravery during a catastrophic first flight aboard a genetically enhanced jellyfish (“The creatures' fishy guts could survive almost any fall, but their human passengers were rarely so lucky”) earns Deryn a post on the living airship <EMPHASIS TYPE=""ITALIC"">Leviathan. The fortunes of war lead Aleksandar and Deryn to the Swiss Alps, where they must cooperate or face destruction at the hands of the Germans. The protagonists' stories are equally gripping and keep the story moving, and Thompson's detail-rich panels bring Westerfeld's unusual creations to life. The author's fully realized world has an inventive lexicon to match—readers will be eager for the sequels. Ages 12–up. <EMPHASIS TYPE=""ITALIC"">(Oct.)

Gr 7 Up-This is World War I as never seen before. The story begins the same: on June 28, 1914, Archduke Franz Ferdinand and his wife are assassinated, triggering a sequence of alliances that plunges the world into war. But that is where the similarity ends. This global conflict is between the Clankers, who put their faith in machines, and the Darwinists, whose technology is based on the development of new species. After the assassination of his parents, Prince Aleksandar's people turn on him. Accompanied by a small group of loyal servants, the young Clanker flees Austria in a Cyklop Stormwalker, a war machine that walks on two legs. Meanwhile, as Deryn Sharp trains to be an airman with the British Air Service, she prays that no one will discover that she is a girl. She serves on the Leviathan , a massive biological airship that resembles an enormous flying whale and functions as a self-contained ecosystem. When it crashes in Switzerland, the two teens cross paths, and suddenly the line between enemy and ally is no longer clearly defined. The ending leaves plenty of room for a sequel, and that's a good thing because readers will be begging for more. Enhanced by Thompson's intricate black-and-white illustrations, Westerfeld's brilliantly constructed imaginary world will capture readers from the first page. Full of nonstop action, this steampunk adventure is sure to become a classic. Heather M. Campbell, formerly at Philip S. Miller Library, Castle Rock, CO

Instead of the Victorian era most often found in the steampunk genre, Westerfeld sets his new series in a Europe hovering on the edge of World War I. The ingenious premise is that Europe is divided not only into traditional historical camps, but also into Darwinists, who genetically manipulate animal "life-strands" into beasts and even whole self-contained ecosystems with wondrous capabilities, and Clankers, whose imposing constructions of metal and gears are a marvel of technological wizardry. Deryn Sharp, from Darwinist England, disguises herself as a boy to enlist on the Leviathan, a flying whale-ship, while Prince Alek, recently orphaned son of Archduke Ferdinand, finds himself on the run in a sort of walking Clanker tank. The plot is boosted almost entirely by exciting and sometimes violent fight sequences, but reading about (and seeing, thanks to Thompson's ample, lavish, and essential illustrations) the wildly imaginative creatures and machines provides nearly as much drive. Fans of Philip Reeve's Mortal Engines (2003) or Kenneth Oppel's Airborn (2004) will be right at home in Westerfeld's alternate reality.

Westerfeld's new series features a mix of alternative history and steampunk. As WWI breaks out, Prince Aleksandar and his advisers flee to the Swiss Alps. Meanwhile, Deryn Sharp, disguised as a boy, is aboard the British airship Leviathan, which crashes near Alek's estate. As the two meet and begin the complicated dance of diplomacy, the story and characters come to life.

The fate of many rests in the hands of an Austrian schoolboy and a British airman, both in disguise. Alek is the son of the recently assassinated Archduke Franz Ferdinand, hiding from European nations hostile to his father. Midshipman Dylan is really Deryn, a girl passing as a boy in order to serve in the British Air Service. Alek has fled home in a steam-powered Stormwalker, one of the great manned war machines of the Central Powers. Meanwhile, Deryn's berth is on a massive airbeast, a genetically engineered hydrogen-breather, one of the Darwinist ships of the Allied Powers. The growing hostilities of what is soon to become the Great War throw the two together, and Darwinists and Clankers must work together if they all want to survive. Two Imperial forces meet, one built with steam and the other built with DNA, producing rich, vivid descriptions of the technologies that divide a continent. The setting begs comparisons to Hayao Miyazaki, Kenneth Oppel and Naomi Novik, but this work will stand—or fly—on its own. (Science fiction. 12-15)

Awakened in the middle of the night, fifteenyear- old Prince Aleksandar, son of Archduke Ferdinand of the Austro-Hungarian Empire, at first thinks he is headed out for some night training in one of the familyÆs Stormwalker war machines. His teachers, however, have entirely different motives for getting the Prince out of the castle. AlekÆs parents have been assassinated, and his life is in danger. Meanwhile fifteen-year-old Deryn Sharp, who studied flight with her now dead father, is so desperate to continue her studies that she has convinced her brother to help her pass as ôDylanö and join the British Air Service. Unlike the ôClankersö of Germany and Austria who depend on machines, the Darwinists of France and England use fabricated beasts (genetically engineered animals) in all aspects of their lives. On a short trip up in a hydrogen-breathing, balloon-like Huxley (a huge animal based on a jellyfish), Deryn flies off course and ends up joining the crew of the whale ship Leviathan. Through battle and circumstance, the two end up becoming friends and find their missions and their lives entwined in this first volume of a new series by the author of the popular Uglies series. Set in 1914, alternate-history science fiction combines well with ThompsonÆs fabulously detailed illustrations but gets a bit of its base science wrong. The inventiveness of the milieu, however, more than makes up for it. The characters are not as engaging or the story as compelling as the many battle sequences, but there is much here to interest fans of ReeveÆs Hungry Cities series or the less-juvenile fantasies of Hayao Miyazaki. ùTimothy Capehart.