The Nine by C.G. harris

Gabe has carved a successful niche into his arctic afterlife, but when Judas Iscariot makes him an offer he doesn't dare refuse, Gabe must leave behind his black-market Twinkies and bootleg Dr. Peppers to become a double agent for the most dangerous organization the world has never heard of.

Easier said than done, especially when his skill set is limited to irritating quips and an eye for button-fly jeans. To make matters worse, his new partner, Alex, is a beautiful, hard-as-nails agent who wants nothing to do with him.

Gabe must figure out how to work with Alex, stop a deadly pathogen from being released Topside, and do it without botching the mission or revealing his true identity. If this unlikely hero can’t figure it out before disaster strikes, facing the wrath of Hell will be the least of his worries…

“I had so much fun with this urban fantasy! I loved the world building, the snark, the somewhat combative relationship between the two main characters (Gabe and Alex), and the idea of undercover operatives in Hell. Yep, the nine circles of Hell. There's all sorts of rules, societies, ways to ‘die', and frenemies in Hell. All together, it's a worthy addition to the Urban Fantasy genre.”
-Dab of Darkness Book Reviews