Once a Rake, Suddenly a Suitor by Christi Caldwell

From bestselling author Christi Caldwell comes the return of the Scandalous Seasons Series. Be swept away in the passion, drama, and splendor of Regency England, where the ballrooms glitter and the dukes are sexy and brooding, and the ladies dare to love.

There have been two constants in Miss Anwen Kearsley’s life: one, she has always loved Phineas Lesar, the Marquess of Landon, her brother’s best friend. And two, like all her cursed relatives, she is fated to die young. Before she turns up her heels, Anwen plans to have a courtship from Phineas any way she can. She thinks it will be enough.
Phineas Lesar, the Marquess of Landon’s rakish reputation precedes him. Unfortunately, so does his status as a gentleman on the edge of debtor’s prison. He’s now on borrowed time to find a wealthy bride. If that isn’t enough responsibility for a hapless rogue, he has Anwen Kearsley coming to him with a favor.
Phineas’s loyalty to the Kearsley family puts him at cross-purposes with his own dire circumstances, and it’s only because Anwen is his best friend’s younger sister that he agrees to her scheme. Except, the more time he spends with Anwen, he begins to notice she is all grown up and spirited and…beautiful—certainly, all of London’s bachelors will be vying for her hand.
Soon Phineas finds himself…entranced by Anwen. There’s a thousand reasons she can’t be his. Is it too late for this rogue to reform? Or is there still time for him to become a man worthy of her?
Unfortunately for Anwen, time is the last thing she does have.