The Duke Is But a Dream by Anna Bennett

Once upon a time three young ladies vowed to record their first London seasons...and to fill in the gaps of their finishing school educations. Thus began The Debutante Diaries-and London will never be the same...
She's a secret sensation.
Miss Lily Hartley is the anonymous mastermind behind the ton's latest obsession: The Debutante's Revenge, a tell-all advice column for young ladies. To keep her identity hidden, Lily delivers her columns disguised as a boy-which is well and good, until she lands in the middle of tavern brawl. As luck would have it, a devastatingly handsome duke sweeps in to rescue her. While she's dressed as a lad. And a bit dazed from a bump on the head.
He has no idea who she is.
Eric Nash, Duke of Stonebridge, discovers there's a beautiful woman hiding beneath a lad's cap, and, before long, he's falling for the delightfully clever stranger recuperating in his house. He vows to help...

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