When a magical plague is released in a Depression-era New York soup kitchen, private detective Alex Lockerby finds himself in a desperate hunt to catch a madman before he can strike again. His investigations lead Alex to a famous thief, a daring heist, and the search for a mythic book of ancient magic, but none of that brings him any closer to finding the man responsible for the massacre. With the police and New York’s Council of Sorcerers desperate to find the culprit, Alex becomes a suspect himself, thanks to his ties to the priest who ran the soup kitchen.

New York Police Lieutenant Danny Pak has a problem. When one of his officers calls him out to an unusual crime scene, Danny realizes that it’s terrifyingly similar to something the department thought was dead and buried. Across town, Agent William “Buddy” Redhorn of the FBI has two problems. He’s been assigned a potentially career-ending case with magical ties, and his sorceress boss is out of town. The case involves a stolen statue that belongs to the government of Brunei, but the more he chases the thieves, the more bodies begin to drop. Bodies affected by an unknown magic.

Since time immemorial the Spires have sheltered humanity, towering for miles over the mist-shrouded surface of the world. Within their halls aristocratic houses have ruled for generations, developing scientific marvels, fostering trade alliances, and building fleets of airships to keep the peace. Captain Grimm commands the merchant ship Predator. Fiercely loyal to Spire Albion, he has taken their side in the cold war with Spire Aurora, disrupting the enemy's shipping lines by attacking their cargo vessels.

For Amber Farrell, post-military life as a PI has its ups and downs: She's been hit by a truck. She's being sued by a client. Denver's newest drug lord just put out a contract on her. The sinister Athanate want her to come in for a friendly chat. And it's only Tuesday. Enter Jennifer Kingslund: rich, gorgeous - a tough businesswoman who's known for getting what she wants in the boardroom and the bedroom.

On the streets of Boston, the world is divided into the ordinary Usuals, and the paranormal Unorthodox. And in the Department of Unorthodox Affairs, the Auditors are the magical elite, government-sanctioned witches with spells at their command and all the power and prestige that comes with it. Grimshaw Griswald Grimsby is…not one of those witches.