Max is back in this second book of the Max Williams Adventure series, My Sister, the Traitor. The series features Max Williams, a super smart kid who wants to work for the CIA, and his crack team of spies-in-training. Max uses his Aikido skills to solve mysteries, and depends on his seventy-year old sensei, Mrs. W for advice. Max has enjoyed being a hero since the big football game last year, but now he has a rival - Mrs. W's nephew, Axel. Axel is smart, popular, and practically a black-belt in Aikido. Even worse - he's dating Max's sister, Belinda. Max hatches a plan to ruin Axel's reputation, but instead, finds himself in the middle of a dangerous crime scene. Max and Axel must figure out a way to work together to solve the crime before Axel is arrested for arson. Or worse - before Hinky, the crime boss, finds them. Max doesn't want to disappoint Sensei W. But, can he fix the mess he's made before he ruins Axel's life? Enjoy this fast-paced martial arts adventure for middle-grade readers.