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After a night out of partying and left behind by her friends，Ava wakes up and sneaks back home only to find that she's already safe IN bed. But that's not Ava - it's someone who looks just like her. A time-traveling fugitive has stolen Ava's body，her identity，and her life. What's more -- she's not alone. There are others，hiding IN the past，secretly living among us，plotting to alter the future. Without her body，Ava is a virtual ghost，silent and invisible to the world. And，so far as she knows，she's the only one who can stop them and put the timeline back on course.