I discovered OOTS around issue 250 or so. I spent almost an entire weekend reading it.
BTW, when you get to the part of the story where you encounter "Haleyspeak" (you'll know it when you see it), don't try and decipher it unless you have either a lot of time to kill or you enjoy frustrating yourself. Yes, it is a simple substitution cypher, but it changes from strip to strip. I don't know what method he is using to create his key. I spent way too much time deciphering what she was saying, but each time I tried, I pretty much started from scratch. He said that the hard copy version has translations in it.