Ruby Logan has always wanted to be seen. With a trouble-making older brother and a demanding baby sister, she’s invisible in the middle. So when her teacher Mr. Cooper—a cool, funny guy everyone loves—is forced to shut down his YouTube Channel “Coop’s Class,” Ruby’s one chance at feeling special is shot.

With internet fame off the table, Ruby and her friends focus on an upcoming overnight field trip—until the principal announces it’s cancelled because someone stole the admission fee. Days later, an anonymous tip says to check Mr. Cooper’s desk. To everyone’s shock, the money is there, and Mr. Cooper is removed; investigation pending.

But there’s no way Mr. Cooper did this. Using journalism techniques they learned in class, Ruby and her friends do their own digging to clear his name. As the clues pile up and the suspect list grows, Ruby finally makes some headway. And what she finds will challenge everything she believed. No, Mr. Cooper didn’t steal the money, but he might have done something else. And maybe Ruby knew about it all along…