The Madness of Lord Ian Mackenzie by Jennifer Ashley 

It was whispered all through London Society that Ian Mackenzie was mad, that he’d spent his youth in an asylum, and was not to be trusted — especially with a lady.

Yet Beth found herself inexorably drawn to the Scottish lord. Despite his decadence and his intimidating intelligence, she could see that he needed help- her help. Because suddenly the only thing that made sense to her was…the Madness of Lord Ian Mackenzie.