The Feast of Souls oleh T.L. Cerepaka

When a pretty young woman comes to me for help in finding her father, I accept, even though I don't need the money. Seems like a simple case and maybe I'll even get the woman's number after this is over.

But when it turns out that her father was kidnapped by a cult run by half-demon/half-human hybrids hellbent on reuniting the forces of Hell, I find myself racing against time to stop them before it's too late.

Yet I might already be out of time to stop them.