Only Enchanting by Mary Balogh

Image linked from Goodreds

Balogh just keeps hitting it out of the park with this series. If you've enjoyed this series so far, I can guarantee that this one will be a good pick.
We've met Flavian, Viscount Ponsonby, in other books. He was broken both physically and mentally during the war. When he got home, his fiancee married his best friend. Now that that friend is dead, his family (and hers) seem to expect that they will marry. But Flavian doesn't want to do that. He's not sure why, but his upcoming meeting with the Survivor's Club should help him relax.
Their meeting also brings him back in touch with Agatha Deering who he met on a previous visit. All of their meetings are just sweet and wonderful in ways that only Balogh can paint.
The character development is wonderful and the way the relationship builds between Agatha and Flavian is wonderful. They don't communicate completely from beginning to end but there aren't any Big Misunderstandings and it's wonderful.