Love's Refrain - The Partridge Christmas Series, #2.5

Lady Laura Montgomery would much rather spend her summer at the family estate, but instead she must act as her stepsister's chaperone for the London season. She takes solace in her poetry books and in her love of music. They're all she has to comfort her as she once again faces the one man who stole her heart ten years ago. Andrew Bradford, Earl of Covington, needs an heir, but he's not looking for love.
His mother has made her selection, but he can't help being drawn to the girl's chaperone. Can he hope to make a match based on more than beauty and suitability?