I found the book hugely enjoyable and surprisingly modern in its depiction of relationships. If I hadn't known it was published in 1949 I would have believed it was a contemporary novel set in the post-war period. I enjoyed all the historical details - I had to look up Eno's Fruit Salts and was amazed to find they still exist! As with many of the other "rather dated" books the depiction of changing class dynamics was an interesting aspect.
I loved the premise of the novel and the suspense it created not knowing who was going to survive. I am actually quite glad I didn't spot the seven deadly sins premise while I was reading it, because that would have taken the suspense away! Although clever, I actually didn't think the premise added much to the book. It reminded me a bit of Small Pleasures by Clare Chambers, where the author was inspired to write a book involving a particular historical incident, and actually it ended up feeling quite tangential to the story she was telling (trying not to include spoilers for those who haven't read that one!).
I thought the author did a great job developing the characters and making us interested in them. Often I find these sorts of novels with multiple points-of-view a bit irritating, because there's usually a few characters I find tedious and others who I want to hear more from. That wasn't the case here. It probably helped that the chapters were fairly short.