All the Rules of Heaven by Amy Lane

When Tucker Henderson inherits Daisy Place, he’s pretty sure it’s not a windfall—everything in his life has come with strings attached. He’s prepared to do his bit to satisfy the supernatural forces in the old house, but he refuses to be all sweetness and light about it. Angel was sort of hoping for sweetness and light. Trapped at Daisy Place for over fifty years, Angel hasn’t always been kind to the humans who have helped him in his duty of guiding spirits to the beyond. When Tucker shows up, Angel vows to be more accommodating, but Tucker’s layers of cynicism and apparent selfishness don’t make it easy. Can Tucker work with a gender-bending, shape-shifting irritant, and can Angel retain his divine intentions when his heart proves all too human?