If you don't know how this works then I'll explain real quick, basically each alphabethon happening you read a book with the next letter of the alphabet, so round 4 was D, and round 5 is E, so you have to read book that starts with E (or has an E on the title, I'm not sure), or the author's first or last name starts with E. I hope you understood my explanation, if not, here's the link to the alphabethon blog.
So let's get into the TBR!