An Offer from a Gentleman (The Bridgertons #3)

Sophie Beckett never dreamed she'd be able to sneak into Lady
Bridgerton's famed masquerade ball -- or that "Prince Charming" would be
waiting there for her! Though the daughter of an earl, Sophie has been
relegated to the role of servant by her disdainful stepmother. But now,
spinning in the strong arms of the debonair and devastatingly handsome
Benedict Bridgerton, she feels like royalty. Alas, she knows all
enchantments must end when the clock strikes midnight. Ever since that
magical night, a radiant vision in silver has blinded Benedict to the
attractions of any other - except, perhaps, this alluring and oddly
familiar beauty dressed in housemaid's garb whom he feels compelled to
rescue from a most disagreeable situation. He has sworn to find and wed
his mystery miss, but this breathtaking maid makes him weak with wanting
her. Yet, if he offers her his heart, will Benedict sacrifice his only
chance for a fairy tale love?