Alright, I am giving you a card code for free! Here it is:
G69CKR3K9T
I am giving you this code for a reason! It may help you later on. Either write it down and type it into the code bar in the Add Cards window on the 39 Clues website, or just copy it and paste it in the same code bar.
It came out today! June 2nd! My theory I guess was kind of right: it has something to do with Howard Carter. Well, there's something about Napoleon and- well, I don't want to spoil it! But you probably know it has to do with the Ekaternia branch. Well, 69 more days until the next book!