Behemoth (Leviathan)

This book continues the hard-driving, action-packed adventures of Alek, heir to the throne of the Austrian empire and current British prisoner of war, and Deryn Sharp, a midshipman assigned to the Leviathan. Their loyalties to their respective governments and philosophies are tested as their friendship grows; Alek is an Austrian Clanker and Deryn an English Darwinist. After the Leviathan is damaged by a German attack, Alek and his personal guard escape the airship and join a revolutionary group dedicated to the overthrow of the sultan of Istanbul.

Leviathan

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. 

The Sorcerer of the North (The Ranger's Apprentice, Book 5)

Will is just settling into his first post as a brand-new, just-commissioned Ranger when he is dispatched to deal with problems on the kingdom’s northern border. Though his keen senses and uncanny expertise with his knives and his bow are vital, Will’s success often hinges on his ability to assess the skills and intentions of those around him. The scenes involving Will, his mentor, Halt, and Halt’s mentor, Crowley, work beautifully to fill in background information, dramatize Will’s growing maturity, and entertain readers with clever dialogue. The Sorcerer of the North is a must-have volume for fans of the popular Ranger’s Apprentice series

The Siege of Macindaw (The Ranger's Apprentice, Book 6)

After years as a Ranger’s apprentice, Will is now the protector of his first fief. Not long into his service, everything that can go wrong does: Keren, a renegade knight, has taken over Castle Macindaw, a strategic gateway to the North—poisoning the royal family in the process—and is holding Will’s friend Alyss captive. The situation grows direr when Will uncovers Keren’s secret alliance with the Scotti, who have plans to plunder Araluen. Time is of the essence, and Will must recruit a motley crew to rescue Alyss and reclaim Castle Macindaw—before the Scotti can make it their own.

The Kings of Clonmel (The Ranger's Apprentice, Book 8)

Mankind puts its faith in many things—gods, kings, money—anything for protection from the world’s many dangers. When a cult springs up in neighboring Clonmel, promising to quell the recent attacks by lawless marauders, people flock from all over to offer gold in exchange for protection. But this particular group, with which Halt is all too familiar, has a less than charitable agenda. Secrets will be unveiled and battles fought to the death as Will and Horace help Halt in ridding the land of a dangerous enemy. The worldwide phenomenon is back with a gripping new adventure.

Yet for these Rangers, the peril is only beginning...