Last week I added Obsidian to my shelf. I loved it so much - that you guessed it - I had to add Onyx this week.
I am currently 3/4 through and definitely not liking the fact that I have to wait for Opal's release.
Another book I just had to have is the last of Becca Fitzpatrick's Hush Hush series - Finale. Managed to get the last copy in the store.
So what's on your shelf? I'd really like to know.