Of the three, I'm definitely looking forward to The Beauty of Darkness the most! I haven't read the book previous to The Ghostly Echoes - I forget the title - wait! Beastly Bones! - but I do have the book on my bookcase somewhere. BUUUUUUUT I will have The Beauty of Darkness soon! I am so excited for it, holy heck.
You know me; I rarely have many releases. Just my luck, these two are coming out on the same day! I'm sad to see the end of the Demon Road trilogy, but Landy has just announced more Skulduggery Pleasant. And I will absolutely be savoring The Witch's Vacuum Cleaner.