The Underworld (#4, Rhyn Eternal)
Rhyn Eternal series, book 4. The time has come for Gabriel to claim his underworld. Accompanied by the deceptive Dark One, he risks everything to find his mate and take his place as the deity Death.
Between him and the only woman he’s ever loved: a handful of rebelling death dealers, the deity Karma and the Dark One’s mate, a human-turned-demon who holds his soul in the palm of her hand.