well, it's obvious that (try to follow this madness) "julia" knew that she was syd cuz she sent that letter to herself no? well, if Julia knew about syd/herself then she would most likely know about her parents right? so it could be possible that julia intercepted Jack and Irinas convos, and used the code to write to syd/herself. that way no one could break it and syd would obviously show Jack, and of course jack would know it. see...so julia could've used irinas code so that only syd and Jack could read it. :blink: so i hope this made sense to ya'll cuz all of my friends think I go crazy when i share this theory.