I like the writing. I believe I could love Anne Stuart if the plot is right. This book however, has the heroine "infiltrating" the hero's household and the hero immediately started scheming to get her into his bed. This is one plotline that almost always turns me off right away. With a "plain Jane" of a heroine, the book has no chance with me.
If you like such plotlines I do think the book is a good read. I personally find plotlines in which the devilishly handsome heros "notice" the plain-looking heroines a turn-off. Worse is when the plain Jane is the devil's employee. This poor book is exactly that. Not for me.