The Devil to Pay by Emma V Leech

Their mothers dared all for love…
Their sisters did the same.
Something wicked this way comes…

A Wicked Son…
Tall, dark and handsome, ridiculously wealthy, and the heir to a title. With so many blessings in his life, for this Wicked Son there is very little point in being anything more than ornamental. Or at least… that is what everyone believes, but this man has a secret. For a man in his position, if anyone discovered he is the mysterious author of The Ghosts of Castle Madruzzo, it would make him a figure of ridicule.
His first novel was a tremendous success, and though his sales are excellent, he is aware he has never quite recaptured the dynamism of that first book. His readers don’t seem to care and clamour for more, yet a certain lady critic keeps plaguing him with bad reviews. Somehow, she has guessed he is a nobleman, and delights in finding fault with his less elevated characters.

A little time undercover should do the trick, to prove to himself, and the lady, that he is nothing if not committed to his art.