Bears of the Ice series

Bears of the Ice is a novel series by Kathryn Lasky. The series is about two bear cubs named First and Second. It is a sequel series and spin-off of Guardians of Ga'Hoole, Wolves of the Beyond, and Horses of the Dawn.

The series has three books so far.

The Quest of the Cubs
For generations, the noble polar bears have ruled the Northern Kingdoms. But now, their society is on the brink of collapse. A group of power-hungry bears has seized control, and darkness is creeping across the snow.

Cubs First and Second don't know any of this. Although they're twins, they couldn't be more different. First loves imagining stories, while his daring sister, Second, wants to live them.

When their mother is taken prisoner, the cubs' world falls apart. They know they have to rescue her, but how can two cubs who've barely learned to hunt survive a treacherous journey across the ice? Their only chance is to learn to trust each other and--even more important--trust themselves.

But survival is only the beginning. And soon, these two unlikely heroes find themselves at the heart of a battle unlike anything Ga'hoole has ever seen.

The Den of Forever Frost
After learning that their mother is being held captive at the dangerous Ice Cap, cubs Stellan and Jytte continue their search for their father, Svern. He's the only one who can gather the other bear rebels and craft a plan to storm the Ice Cap. But the secret to defeating the Grand Patek lies deep in the legendary Den of Forever Frost--a place that some bears claim never existed at all.

Now, it's up to the cubs to find the tool before the enemy closes in. But their chances are slim-the Grand Patek has a secret weapon at his disposal--one with the power to destroy everything the creatures of Ga'Hoole hold dear.

In this second book in the Bears of the Ice series, bestselling author Kathryn Lasky lures readers deeper into a vividly-imagined fantasy world full of magic, adventure. . . and animal heroes unlike any other.

The Keepers of the Keys
Against all odds, cubs Stellan, Jytte, Third, and Froya have found the key hidden inside the legendary Den of Forever Frost. Now, they have everything they need to destroy the dangerous ice clock. Everything. . . except an army. The power-hungry Grand Patek will stop at nothing to protect the clock, the source of his authority. And so, it's up to the cubs to convince the animals of Ga'Hoole to join the fight-a journey that'll take them from the fabled owl parliament to the rugged territory of the wolves of the beyond. But the owls and the wolves have secrets of their own -- secrets that threaten to fracture the fragile alliance. Do Stellan and Jytte have what it takes to become the leaders of the resistance? Or will the bears be left on their own to battle the greatest enemy Ga'Hoole has ever known?