Cordelia Carstairs, a Shadowhunter trained to battle demons, travels with her brother to London where they reconnect with childhood friends but soon must face devastating demon attacks in the quarantined city. Edwardian London, a time of electric lights and long shadows-- with demons waiting in the dark. For years there has been peace in the Shadowhunter world. James and Lucie Herondale have listened to stories of good defeating evil and love conquering...

"Pratchett's humor is international, satirical, devious, knowing, irreverent, unsparing, and above all, funny." —Kirkus Reviews

Determined to create a wish granting demon, an inept young demonologist instead conjures the Discworld's most incompetent wizard in this devilishly humorous adventure in Sir Terry Pratchett's internationally bestselling fantasy series.

Discworld's only demonology hacker,

...

"Bryce Quinlan and Hunt Athalar are trying to get back to normal they may have saved Crescent City, but with so much upheaval in their lives lately, they mostly want a chance to relax. Slow down. Figure out what the future holds. The Asteri have kept their word so far, leaving Bryce and Hunt alone. But with the rebels chipping away at the Asteri's power, the threat the rulers pose is growing. As Bryce, Hunt, and their friends get pulled into the rebels'...

"Poppy never dreamed she would find the love she's found with Prince Casteel. She wants to revel in her happiness but first they must free his brother and find hers. It's a dangerous mission and one with far-reaching consequences neither dreamed of. Because Poppy is the Chosen, the Blessed. The true ruler of Atlantia. She carries the blood of the King of Gods within her. By right the crown and the kingdom are hers. The enemy and the warrior... Poppy...

The world is preparing to come to an end according to the Divine Plan recorded in the Nice and Accurate Prophecies of Agnes Nutter, Witch (recorded 1655). Meanwhile, a fussy angel and a fast-living demon have grown fond of living among the earth's mortals for many millennia and are not looking forward to the apocalypse. If Crowley and Aziraphale are going to stop it from happening, they must find and kill the Antichrist.

"What happens after you've saved the world? Well, if you're Rachel Mariana Morgan, witch-born demon, you quickly discover that something might have gone just a little bit wrong. That the very same acts you and your friends took to forge new powers may have released something bound by the old. With a rash of zombies, some strange new murders, and an exceedingly mysterious new demon in town, it will take everything Rachel has to counter this new threat...

His name is Koldo. He is scarred, powerful, his control legendary and he lives only for vengeance against the angel who viciously removed his wings. But if he yields to the forces of hatred, he will be eternally damned. Nicola Lane was born with a defective heart, yet this fragile human shows surprising strength as demons stalk her every move, determined to end her. She is the key to Koldo's deliverance and his downfall. Though he fights duty, destiny...

Things get a little devilish in the sixth Broken Heart novel from New York Times bestselling author Michele Bardsley. 
Everybody makes mistakes—my first one was named Connor, a heart-stealing Scottish hottie. I thought our night together was the beautiful beginning to a love story, which turned out to be my second mistake. I, Phoebe Allen, lifelong Broken Heart resident and vampire, am now mated to a half-demon.
Thankfully...

Lyra and Will find themselves at the center of a battle between the forces of the Authority and those gathered by Lyra's father, Lord Asriel. The final book in the Dark Materials trilogy is now available in trade paperback. Lyra and Will are in danger, but with help from Iorek Byrnison, the armored bear, and two Gallivespian spies, they must journey to a dark world where no living soul has gone. Meanwhile, Dr. Mary Malone builds an amber spyglass...

Seventeen-year-old Jesse starts experiencing several disconcerting and indescribable things after his neighbor's death. As he looks into these occurrences, he discovers that he has been chosen for possession by a malicious demon.