Her Duke at Midnight by Wendy LaCapra

A governess and her secret take an invincible duke by storm…

The Duke of Hurtheven will stop at nothing to protect those he loves. So, when a mysterious new governess captures his godchild’s affection, he vows to uncover her secrets. Instead, she sets him aflame.
Miss Hera Bythesea accepted a governess position to secure the character reference she needs to reclaim her secret child. But she did not count on Hurtheven—curious, relentless, and temptation in human form.
In Hera’s world, Hurtheven faces a challenge his power and wealth cannot solve. But for the love of unwed mother and child, he’ll undertake any Herculean Labor.