Sophie Valentine would rather be at home, doing school virtually. Instead, she's waiting in a crowded middle school building for her best friend, Eve, who's finally back after an extended absence, which only Sophie knows the truth about.

But when Eve returns, things aren't the same. First, Eve stops walking to school with her in the morning. Then, she's ditching Sophie to hang out with the Crash Crew, a group of popular kids notorious for their social media dares. Eve seems to fit right in, but Sophie is devastated: Did she just lose her best friend?

When rumors surface that Eve is hiding a painful secret she didn't share with Sophie, Sophie is spurred on an investigation to discover what--or who--caused the incident behind Eve's sudden change...and why all clues lead back to the Crash Crew. Using lessons from her forensics class and the help of a new friend, Sophie will have to uncover the truth before more harm is done.