Double Negative — Scholastic Inc.

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In lots of ways, Ben Tennyson is just a regular teenage boy going about his everyday life. But recently his girlfriend Julie has noticed that something seems different about him. Even his parents begin to notice. So when Ben sneakily uses his access into Plumbers' HQ to steal some top secret alien intel, Gwen and Kevin decide to shadow him -- and the jig is up. Can Gwen, Kevin, and Julie figure out what happened to the *real* Ben -- and get him back?