In 1920s Arnsmouth, Emma Mather will stop at nothing to find her missing twin brother—even if it means tangling with the city’s darkest forces.

When her search leads her to the enigmatic Professor Saltonstall, she discovers a man as dangerous as he is alluring. With shadows that move of their own accord and a knife that’s all too willing to draw blood, Rafe is no ordinary academic… he’s a member of the Dark Societies that have secretly controlled Arnsmouth for centuries.

As Emma delves deeper into the occult underworld, she finds herself irresistibly drawn to Rafe and the monstrous entities that lurk within his shadows. Their forbidden attraction ignites amid eldritch horrors and ancient conspiracies, even as rival societies hunt Emma for reasons she can’t begin to comprehend.

But in a city where darkness hungers and secrets kill, their passion might be the deadliest danger of all.