Regina continued on her undercover mission with the Queens of Darkness on Once Upon a Time Season 4 Episode 16 but still managed to get an important message back to Emma and the Charmings.
The Dark One had returned to Storybrooke.
Hook made a deal with Ursula to uncover Gold's secret plans. He'd give her the happy ending she longed for if she told him what Gold was up to. It turned out that getting happy endings is more complicated than just finding the author.
After watching his nose grow several sizes, August is rescued and tells Regina the truth. The author is trapped in his own book. But the author isn't the only one that Gold is after. Turns out that some happy endings are due to the Savior and therefore he plans to fill her heart with darkness in order to ensure that the villains get their happy endings this time.
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