The Forest Bull — Terry Maggert

Three lovers. Two immortals. One mystery.
When Ring Hardigan isn't making sandwiches for, and with, his two partners, Waleska and Risa (they're cool like that), he's got a busy schedule doing the dirty work of sending immortals to the ever after. Wally and Risa provide linguistics, logistics, and finding the right place for him and his knife.
A reclusive Baron from the timelost forests of Europe asks for their help--find a stolen collection of jewelry, and find the thief--his daughter Elizabeth, an immortal of purest evil who wants nothing less than control of Hell itself. With the help of a 2400 year old succubus hooker named Delphine, they might just live long enough to what is evil, who is human, and exactly who wants to reign in hell.