Deep within Gloamingard Castle lies a black tower. Sealed by magic, it guards a dangerous secret that has been contained for thousands of years. As Warden, Ryxander knows the warning passed down through generations: nothing must unseal the door. But one impetuous decision will leave her with blood on her hands - and unleash a threat that could doom the world to fall to darkness.

Until an oracle predicted my regal future, I'd never imagined myself rising above the curve of my round ears. After all, I was the magicless halfling loved by beasts but loathed by every pure-blooded faerie at court. Well...by all but one.

Askia became heir to the Frozen Crown of Seravesh because of her devotion to her people. But her realm is facing a threat she cannot defeat by sheer will alone. The mad emperor of the Roven Empire has unleashed a horde of invading soldiers to enslave her lands. For months, her warriors have waged a valiant, stealth battle, yet they cannot stop the enemy’s advancement. Running out of time, she sets sail for sun-drenched Vishir, the neighboring land to the south, to seek help from its ruler, Emperor Armaan.

The Four Realms—Life, Death, Light, and Darkness—all converge on the city of dusk. But the gods have withdrawn their favor from the once thriving and vibrant metropolis. And without it, all the realms are dying. Unwilling to stand by and watch the destruction, the four heirs to divine power—Angelica, an elementalist with her eyes set on the throne; Risha, a necromancer fighting to keep the peace; Nikolas, a soldier who struggles to see the light; and Taesia, a shadow-wielding rogue with a reckless heart—will become reluctant allies in the quest to save their city.

Theodosia was six when her country was invaded and her mother, the Fire Queen, was murdered before her eyes. On that day, the Kaiser took Theodosia's family, her land, and her name. Theo was crowned Ash Princess - a title of shame to bear in her new life as a prisoner. For 10 years, Theo has been a captive in her own palace. She's endured the relentless abuse and ridicule of the Kaiser and his court. She is powerless, surviving in her new world only by burying the girl she was deep inside.

When the fae king of Naenden returns home to his palace only to find that his human queen has committed treason by conspiring to assassinate him, he has the queen executed and decrees that once every mooncycle, he’ll marry a human woman from the kingdom, only to execute her the following morning. Unless one woman offers herself as a sacrificial bride for the rest.

Once, there were four worlds, nestled like pages in a book, each pulsing with fantastical power and connected by a single city: London. Until the magic grew too fast and forced the worlds to seal the doors between them in a desperate gamble to protect their own. The few magicians who could still open the doors grew more rare as time passed and now, only three Antari are known in recent memory—Kell Maresh of Red London, Delilah Bard of Grey London, and Holland Vosijk, of White London.

Librarian Sylvia Ashe knows nothing about her past, having grown up without a father and a mother who refused to discuss him. When she stumbles upon a diary that suggests she's descended from magicians, she's skeptical. After all, magicians are special, and she's just an ordinary woman who loves books. She seeks answers from a member of the most prominent family of magicians, but she quickly learns that finding the truth won't be easy, especially when he turns out to be as artless as her, and more compelling and dangerous than books.

A Great Winged One will soon arise and cast his fearsome shadow upon the land. And just as Night slays Day, and Day slays Night, so also shall another Black Witch rise to meet him, her powers vast beyond imagining. So foretells the greatest prophecy of the Gardnerian mages. Carnissa Gardner, the last prophesied Black Witch, drove back the enemy forces and saved her people during the Realm War. Now a new evil is on the horizon, and her granddaughter, Elloren, is believed to be Carnissa's heir—but utterly devoid of power in a society that prizes magical ability above nearly all else.

Hessa is an Eangi: a warrior priestess of the Goddess of War, with the power to turn an enemy's bones to dust with a scream. Banished for disobeying her goddess's command to murder a traveller, she prays for forgiveness alone on a mountainside. While she is gone, raiders raze her village and obliterate the Eangi priesthood. Grieving and alone, Hessa - the last Eangi - must find the traveller and atone for her weakness and secure her place with her loved ones in the High Halls.

Irene is a professional spy for the mysterious Library, which harvests fiction from different realities. And along with her enigmatic assistant Kai, she's posted to an alternative London. Their mission - to retrieve a dangerous book. But when they arrive, it's already been stolen. London's underground factions seem prepared to fight to the very death to find her book. Adding to the jeopardy, this world is chaos-infested - the laws of nature bent to allow supernatural creatures and unpredictable magic. Irene's new assistant is also hiding secrets of his own.

And now, her uncle wants to marry her off to the fallen son of her arch-enemy. But Jael is a battle-hardened warrior, trained to kill since she was 10-years-old. She doesn’t plan on being anyone’s wife. Eadmund Skalleson is drunk. His father is threatening him with a wife again. And this time he’s given him an ultimatum. Marry Jael Furyck or your brother returns from exile. But if Eadmund was ever going to choose a wife, it wouldn’t be Jael Furyck. Not her. Not ever.

The orphaned Elsie Camden learned as a girl that there were two kinds of wizards in the world: those who pay for the power to cast spells and those, like her, born with the ability to break them. But as an unlicensed magic user, her gift is a crime. Commissioned by an underground group known as the Cowls, Elsie uses her spellbreaking to push back against the aristocrats and help the common man. Elite magic user Bacchus Kelsey is one elusive spell away from his mastership when he catches Elsie breaking an enchantment. To protect her secret, Elsie strikes a bargain.

Annie and Lee were just children when a brutal revolution changed their world, giving everyone—even the lowborn—a chance to test into the governing class of dragonriders. Now, they are both rising stars in the new regime, despite backgrounds that couldn't be more different. Annie's lowborn family was executed by dragonfire, while Lee's aristocratic family was murdered by revolutionaries. Growing up in the same orphanage forged their friendship, and seven years of training have made them rivals for the top position in the dragonriding fleet.

Henrietta Howel can burst into flames. Forced to reveal her power to save a friend, she's shocked when, instead of being executed, she's invited to train as one of Her Majesty's royal sorcerers. Thrust into the glamour of Victorian London, Henrietta is declared the chosen one, the girl who will defeat the Ancients, bloodthirsty demons terrorizing humanity. She also meets her fellow sorcerer trainees.