Demons overrun the city of San Francisco in the 1920s, leaving it to supernatural gumshoes to deal with them and protect the public at large...

Falan and his fearless partner, Cassi Wu, are no strangers to danger. When they arrive at a sinister house on McAllister Street, they expect a routine demon hunt. But what they find is unlike anything they've faced before—an angry, transparent force that nearly kills them both and laughs in the face of their usual tactics.

The danger escalates when a dead girl appears in their mentor Byron's front parlor with a chilling message: A Shadow is coming. It's almost here. And it wants to destroy all life. Ghosts materialize across the city—flashes of light, brief as lightning strikes. But ghosts aren't supposed to exist... are they?

As the clock ticks down, Falan realizes that Cassi's earlier warning might have been prophetic: a deadly force is closing in. Can they uncover the true nature of the Shadow before it's too late? And can they stop it before it consumes everything they hold dear.

Come along on a swell adventure full of suspense, in the final entry in The Byron Trilogy.