Well, that went fast!
Graven was always intended to be a short serial, with an estimated posting time of about six months, which it would have been if I'd stuck to the original schedule. But I ended up writing so far ahead, I finished the whole thing much earlier than anticipated. Impatient as I am, I went ahead and posted it all and put together the ebook!
You can read it here: http://gravenserial.blogspot.com/