Horns For Hell

In between Angels Before Man and Angels & Man:

The fallen angel of fruit Rosier lives among cold caves and fiery demons with a soft heart succumbing to comfortable misery. He shares a bed with the monster who'd been his most beloved friend in Heaven, captive now to a beastly body of eternal rot. If there is any love left between them, it's surely a ghost fading with each daybreak. But when the devil commands Rosier to have the Earth bloom with its first fruits — Rosier must confront whether there is really any life after falling from paradise and whether there is really any solace in abandoning all hope.

(Contains spoilers for both full-length Angels books).