Constantinople, 1876. Nikola Tesla sacrificed his humanity to defeat death; and the world will suffer for it.

Sixteen years later, Tesla has built something impossible on a remote Vermont mountaintop: a monstrous tree that fuses metal and flesh, and a chrysalis pod designed to resurrect his brother.

But in his desperation, a fateful message is sent across the void of space, awakening a vast, cosmic horror and its ancient high priest, Yarl'Nagotha.

As the eastern seaboard erupts into an eldritch war zone of Lovecraftian nightmares, Tesla finds unlikely allies in the chaos:

Ruby Turner, a sharpshooter with a deadly smile; Luther Davidson, an ex-slaver turned wandering priest whose soul is as scarred as his body; and Michael Clark, an Irish miner piloting the most cantankerous steam-powered exoskeleton this side of the Mississippi, help Nikola battle back to a weapon hidden on Long Island powerful enough to destroy a god.

But Tesla faces a dreadful choice: cling to the past, or sacrifice everything to save the world he helped condemn to destruction.

Dreadful Tendencies is a dark fusion of alternate history, steampunk, and cosmic horror that forges a tale of grief, obsession, faith, and the terrible price of defying mortality.