When twenty-two-year-old Seven Gillespie dies suddenly, doctors call it natural causes. His twin sister Sera is left reeling, certain that something about his death doesn't make sense. Healthy people don't simply collapse, and twins don't lose half of themselves without consequence.
A mysterious stranger claims her brother's death was no accident; that alternate universes exist. Suddenly Sera is seeing people thought she saw vanish out of the corner of her eye, classmates whose personalities change overnight.
Someone is moving between universes, killing across realities and leaving replacements in their wake. As versions of herself begin disappearing, Sera must decide: succumb to grief, or hunt the killer across worlds before she becomes the next to vanish.
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