Guilty Pleasures of a Bluestocking by Olivia Bennet

He is her final wish. She is his new beginning.
After her sister’s untimely passing, Deborah Wilds is ready to marry the Duke of Tarsington in her place. Despite the circumstances, she can’t help the flare of excitement in her belly at the thought of marrying the man she’s been secretly in love with for years.
Though plagued by his intended’s sudden death, Leonard Fletcher, Duke of Tarsington, resolves to do his duty and honor his parents’ agreement by marrying Edith’s younger sister. He never imagined that the younger Miss Wilds would be so easy to fall in love with.
Deborah’s world shifts on its axis when she discovers her sister’s diary. But there’s only one problem: important pages with events leading up to her death appear to have been violently torn and taken…
Determined to discover what really happened to Edith, Leonard and Deborah unwittingly put themselves in grave danger. First, come the letters, then comes the handkerchief. And then Deborah walks in an old house, never to walk out again…