When sixteen-year-old orphan Tessa Fell's older brother suddenly vanishes, her search for him leads her into Victorian-era London's dangerous supernatural underworld, and when she discovers that she herself is a Downworlder, she must learn to trust the demon-killing Shadowhunters if she ever wants to learn to control her powers and find her brother.

Emma is torn between her passion for Julian and her need to protect him from the consequences of a forbidden romantic partnership, a situation challenged by her relationship with Mark and his efforts to regain his Shadowhunter capabilities.

Twelve-year-old Aru stretches the truth to fit in at her private school, but when she is dared to prove an ancient lamp is cursed, she inadvertently frees an ancient demon.

As Fjerda's massive army prepares to invade, Nikolai Lantsov will summon every bit of his ingenuity and charm to win this fight, and Zoya Nazyalensky must embrace her powers to become the weapon her country needs, meanwhile Nina Zenik risks discovery and death as she wages war on Fjerda from inside its capital.

Still pursuing a cure for her mother's enchantment, Clary uses all her powers and ingenuity to get into Idris, the forbidden country of the secretive Shadowhunters, and to its capital, the City of Glass, where with the help of a newfound friend, Sebastian, she uncovers important truths about her family's past that will not only help save her mother but all those that she holds most dear.

Teenaged criminal mastermind Artemis Fowl must save the underwater fairy metropolis of Atlantis from danger, while battling a psychological affliction known as the Atlantis Complex.