Fics like Changing the Past

Alyssa Adams, a CIA analyst, is sent from her own time to the future by means unknown to her. Arriving on the Citadel, a place she knew only from her favorite video games, she decided to make the best of it. Realizing that she arrived just before the Normandy is about to leave for the Eden Prime mission, she uses her knowledge of the Reaper War to help John Shepard and the Normandy crew navigate their missions and minimize casualties. And along the way, she falls in love.

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