Kate O'Hearn Books in Order

In a kingdom where girls are controlled by brutal laws, twelve-year-old Kira dreams of becoming a dragon knight. When her family is torn apart, she and her sister Elspeth flee and become the focus of a dangerous prophecy.

Separated by a failed spell, Kira and Elspeth are flung into different eras. While Elspeth must survive a distant past, Kira struggles through a strange future to reunite her family and challenge the cruel monarchy.

Lori Watson hears a warning that sends her to the misty island of Herm, where the truth about her missing mother and her own nature begins to emerge. With a young humpback whale beside her, she faces hunters and a family secret.

During a blackout in Manhattan, thirteen-year-old Emily finds a wounded Pegasus on her roof. Teaming up with Joel, she is pulled into a fight involving Roman gods, monsters, and a desperate race to save Olympus.

Emily is in Olympus with Pegasus, but the Nirads invade again. While she longs to rescue her father from the CRU in New York, old grudges and new enemies pull her into another war.

A Pegasus lookalike in Nevada sends Emily, Pegasus, and her friends back to the human world. What starts as an investigation leads from Area 51 to Las Vegas and toward a conspiracy that could set humans against Olympus.

A deadly plague is killing the Olympians, and Pegasus is fading fast. To save him, Emily journeys back to the origins of Olympus and into the first great war between the gods and the Titans.

Freya is about to take up her duties as a Valkyrie, but she wants no part of a life spent reaping souls. A first mission sends her to the human world, where compassion becomes its own kind of rebellion.

Still under suspicion in Asgard, Freya returns to the human realm to find the missing Valkyrie Brünnhilde. The search uncovers darker secrets and pulls her toward the Frost Giants, new enemies, and the threat of war.

The Titans have found a power to rival the Flame of Olympus, and Emily's own hold on that flame is slipping. She and Pegasus race to Hawaii and Diamond Head before the Titans, or the CRU, get there first.

Weakened after Hawaii, Emily heads to London with Pegasus, Joel, and Paelen to save Agent B from the CRU. The rescue uncovers dark secrets about the agency, and about Emily herself.

War breaks out across the Norse worlds, and the bridge back to Asgard is closed. Freya and the Valkyries must trust risky allies, race between realms, and stop the fighting before both Asgard and Earth are destroyed.

Fifteen years after Olympus falls, Titan girl Astraea discovers a human boy on the forbidden world of Titus. She, Zephyr, and a small band of friends uncover an invasion plot that could restart war and threaten the universe.

With prisoners hidden on Earth and the Mimics closing in, Astraea and her friends head to a dangerous jungle world for help. Instead they find dinosaurs, brutal heat, fresh injuries, and a rescue mission that keeps growing.

Riley and her cousin Alfie are swept off a family sailboat in the Bermuda Triangle and wake on Atlantis. To find their parents and escape, they must navigate a beautiful island full of creatures, factions, and dangerous secrets.

Astraea, Zephyr, Pegasus, and Tryn are barely holding off the Mimics when more friends are captured. Their only chance may be a desperate strike at the Mimic home world, with help from allies they never expected to trust.

Home in Colorado at last, Riley hopes the adventure is over, but the Atlanteans hiding with her family are growing sick away from the island's magic. A local crime wave and rising pressure send Riley and Alfie back to Atlantis.

After a string of Red Moons and an earthquake, Atlantis is unraveling. When several of Riley's friends are kidnapped, she leads a risky journey into the Enchanted Territory, chasing answers that could save the island or tear it apart.