On Once Upon a Time this Sunday, Regina will be determined to hunt down the author of Henry's magical book - but she won't be having any luck, not even with her son by her side.

So she and Henry decide to call in reinforcements. This time they turn to Marco and Pinnochio. 

Will the little boy who was once made of wood be able to come up with a clue concerning the mysterious author who wrote about them all. 

And Mary Margaret and David decide to take a stroll through the tunnels of the mine. We're betting it has something to do with the newest residents of Storybrooke. What terrible secret are Cruella de Vil and Ursula holding over the heads of Snow White and Prince Charming?

Check out these photos from Once Upon a Time Season 4 Episode 14, "Unforgiven," scheduled to air Sunday, March 8 on ABC at 8/7c.

Once Upon a Time photos "Unforgiven"

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C. Orlando was a TV Fanatic Staff Writer. Follow her on Twitter.