Brinlee Luster brushed off the exhaustion and stomach cramps as stress. She was finishing college, planning a wedding, and racing toward graduation. At first, the changes were easy to dismiss. A cold that wouldn't clear up. An unsettled, uncomfortable feeling in her gut that could be anxiety. Feeling winded on an easy hike.

But as the pain sharpened and she started leaving class 10 times to use the bathroom, she knew something was seriously wrong.

Or more accurately, her sister did. Mariela Luster and Brinlee are identical twins who share everything together — attending the same college, in the same program, even meeting their husbands on the same day at the same community event. Their voices are nearly indistinguishable; even their parents struggle to keep track of who's who on their po

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