The Ghost Gun kills what it hits, its ghost bullets ensnaring the victim's soul to their killer.
Except that nothing is that simple.

Certainly not an apparently simple theft that leads detectives into a war between secret societies over artifacts which have been around for millennia, their origin unknown, their abilities inexplicable.

Demoted to Vice due to departmental politics, Detective Cassie Kinsala sees an opportunity to restore her career path. But what looks like it might offer a decent arrest soon turns into a quagmire the law might not cover, and might not protect her from.
Jimmy Bancroft used to be a cop. Working for the other side lets him avoid paperwork. Investigating rumours of a competitor moving in on his employer's interests, he becomes entangled in a war between criminals and a secret society. And someone might be trying to set him up.