The first time I read these books, I was nervous about Hart's story. He's a bit like Wulfric Bedwyn from Mary Balogh's Slightly series except Wulfric was more sympathetic and my real issue was whether or not Balogh could write a heroine worthy of him. Hart is just much harder character and though he loosened up in Lady Isabella and Many Sins, it was hard for me to get past the story in Madness when his mistress nearly killed Beth.
I knew that Eleanor could stand up to him -- we met her briefly in Many Sins in which she counseled Ainsley and ran into Hart in Ediburgh. Her jilting of Hart has been referred to in every book. I just wasn't confident that I was ever going to warm up enough to him to want a happy ending for him.
While there are some minor quibbles in the romance and characters, I have to say that this story definitely managed to make me want a happy ending for Hart. His maddening need for control was very well written and his growing dissatisfaction even as he grows closer to his goal was very well done, and I thought Eleanor did a good job of holding her own, even if I wasn't entirely sold on a few pieces.