Danger at the Iron Dragon

Nancy, Bess, and George start jiujitsu lessons at Iron Dragon MMA, where Nancy quickly finds herself enjoying the new challenge. However, their training session is interrupted by a disturbing act of vandalism involving a dead rat and a threatening message, raising concerns about rival academies trying to sabotage the upcoming competition. As Nancy investigates, she uncovers unexpected and increasingly risky developments that put her sleuthing skills to the test.