Phasma by Delilah S. Dawson
Ever wondered who chrome-armored Captain Phasma is behind the mask? In this story, an encounter between a high-ranking First Order stormtrooper and a Resistance spy reveals the secrets of Phasma's backstory - you may even get a glimpse at what she looks like beneath her helmet!

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This is a book from the New Canon timeline! It's guaranteed to be consistent with future movies, TV shows, books, and comics (and all new stories since mid-2014).