It was Henry, Regina’s adoptive son (also Emma’s son who she gave up at his birth), who has a book of fairy tales called Once Upon a Time, who found Emma and told her she was the only one able to break the spell.
The first season ended with Emma breaking the curse and everyone getting back their memories but still being stuck in Storybrooke and no way to go back to their previous land. Rumpelstiltskin brought magic to the town but no one knows why.
2x01 : Broken (Sep. 30, 2012)
The story picks up just after the cursed was broken at the end of last season and with Rumpelstiltskin having brought back magic to Storybrooke.
2x02 : We Are Both (Oct. 7, 2012)
2x03 : Lady Of The Lake (Oct. 14, 2012)
This episode focuses on Emma and Snow, prisoners from Mulan. They meet Regina’s mother there. Meanwhile, in Storybrooke, Henry and Prince Charming try to find if Regina has a way to Fairy Tale world.
2x04 : The Crocodile (Oct. 21, 2012)
From the clip, we found out that Captain Hook will interact with our heroes. There is no clue yet on if it happened in the past or in present time.