"Two dragonriders must go head-to-head for the top position in the Callipolan fleet, and protect the new regime from those who lost power"--

The third novel in legendary author and Discworld creator Terry Pratchett and award-winning science fiction writer Stephen Baxter's "Long Earth" series, which Io9 calls "a brilliant science fiction collaboration."

2040. The Long Earth is in chaos. . . .

The cataclysmic Yellowstone eruption is shutting down civilization. Whole populations flee to the relative safety of myriad stepwise Earths. Sally Linsay, Joshua Valiente,

...

"Elloren Gardner and her friends were only seeking to right a few wrongs when they rescued a Selkie and freed a military dragon. The last thing they expected was to be thrust into a realm-wide underground resistance against Gardnerian conquest. While the Resistance struggles to fight back against the harsh rulings of the Mage Council, more and more Gardnerian soldiers descend upon the University, led by none other than Lukas Grey, now commander of...

"The boys of Huaxia dream of pairing up with girls to pilot Chrysalises, giant transforming robots that can battle the aliens that lurk beyond the Great Wall of China. It doesn't matter that the girls die from the mental strain. When 18-year-old Zetian offers herself up as a concubine-pilot, it's to assassinate the ace male pilot responsible for her sister's death. But when she gets her vengeance, it becomes clear that she is an Iron Widow, a rare...

"After saving her nation of Nikan from foreign invaders and battling the evil Empress Su Daji in a brutal civil war, Fang Runin was betrayed by allies and left for dead. Despite her losses, Rin hasn't given up on those for whom she has sacrificed so much--the people of the southern provinces and especially Tikany, the village that is her home. As her power and influence grows, will she be strong enough to resist the Phoenix's intoxicating voice urging...

"The hunt is over. After fifteen years of lies and sacrifice, Baru Cormorant has the power to destroy the Imperial Republic of Falcrest that she pretends to serve. The secret society called the Cancrioth is real, and Baru is among them. But the Cancrioth's weapon cannot distinguish the guilty from the innocent. If it escapes quarantine, the ancient hemorrhagic plague called the Kettling will kill hundreds of millions...not just in Falcrest, but all...

"Jade, the mysterious and magical substance once exclusive to the Green Bone warriors of Kekon, is now known and coveted throughout the world. Everyone wants access to the supernatural abilities it provides, from traditional forces such as governments, mercenaries, and criminal kingpins, to modern players, including doctors, athletes, and movie studios. As the struggle over the control of jade grows ever larger and more deadly, the Kaul family, and...

Is love stronger than vengeance? A betrayal. Everything Poppy has ever believed in is a lie, including the man she was falling in love with. Thrust among those who see her as a symbol of a monstrous kingdom, she barely knows who she is without the veil of the Maiden. But what she does know is that nothing is as dangerous to her as him. The Dark One. The Prince of Atlantia. He wants her to fight him, and that's one order she's more than happy to obey....

As Neal, Julie, and Keeah search for the all-powerful Moon Medallion in Ut, a magical city in a bottle, they realize that the Medallion has been split into four pieces, greatly increasing the difficulty of their quest.