Buffy vamp spike human?

Hi I can't remember the name or author or even where I read it lol what I do remember is that spike is a human who slays vamps and has some bad history with Angel think it has something to do with Dru.
Buffy is a vamp Angel is her sure but somehow she ends up being captured my Spike and he chains her to his bath tub witch is filled with holy water and she gets pretty badly burned?
Any suggestions? Because I am totally lost and have searched everywhere.

That's Love and Death Embrace by Addie Logan

Summary: Once, William Pratt was a quiet poet, madly in love with his wife, Drusilla. Now, Spike is a loner, hunting in the night for the monster who took her away. He is focused on vengeance, making no room for anything else in his life – until his plan to get his revenge takes a turn he never could have predicted.