DANGER AT THE IRON DRAGON, CAROLYN KEENE

Nancy, Bess, and George’s Jiu-Jitsu lessons turn into a takedown of another sort in the twenty-first book in the Nancy Drew Diaries, a fresh approach to a classic series. After a close call, Mr. Drew insists that if Nancy’s going to be an amateur detective, she needs to be able to defend herself. So Nancy, Bess, and George decide to check out a Jiu-Jitsu class at Iron Dragon MMA. The technique is hard, but before she knows it, Nancy’s having a lot of fun. And then, just as class ends, the students are shaken by a disturbing sight—someone’s left a dead rat on the front desk and spray-painted traitor” on the wall.