Her Duke at Midnight - Mythic Dukes, #3

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.