Hi there and welcome.
If you are interested in Eddy, you will enjoy this book! I think I have seen the majority of photos of him that are out there, but there is one rare photo I've never seen of him with Helene, so that is a treat in itself. Eddy's letters, while giving no huge secrets away about him or his relationship with Helene, do reveal a lot about his personality. I was struck by how chatty he was, how self-deprecating and how frank with his personal feelings.
I haven't yet read it cover to cover but I'm sure you'll be glad to own it!