Lady's Guide to Rakes by Kathryn Caskie
Having had her heart broken by a reformed rake, Meredith Merriweather is determined to help with other young ladies avoid falling for the wrong man. Meredith intends to tempt the most notorious rake in all of London, the devilishly handsome Alexander Lamont, and then document the results in a cautionary guidebook called A Lady's Guide To Rakes. But soon Alexander decides that Meredith is the woman for him. And as he uses all his rakish charms to win her heart, Meredith finds herself tempted to give in to a man no woman should trust, let along love.