there is one main rule that all vampire's have to keep, no matter what.
keep the secret
but eventually someone was bound to slip up, human eyes were bound to catch something they shouldn't, and a serious of event began to spiral uncontrollably, centring on forks.
it could have started when an innocent human girl witnessed the transformation of a werewolf, prompting her to undertake personal research into the mythology of the supernatural.
or it could have been when word got round to vampire hunters that most of the worlds covens were congregating in a rainy washington town.
either way, the cullens home is centre of attention once more, and the interest of the volturi are beginning to stir.