Gertrude Chandler Warner

"Jessie Alden thinks her days of solving mysteries are over. With her new role at the student newspaper, as well as classes, friends, and boys, there’s a lot to keep up with. And Jessie always likes to be prepared. But when a new boy at school comes to her with information about strange things taking place at his parent’s business, and she also finds out the club she’s writing her first feature on seems to know something about it, Jessie realizes...