In this sequel to “Trading Faces,” twins Emma and Payton get out of detention (for playing the ‘ol twin switcheroo” in book 1) in exchange for tutoring the counselor’s son in math.  The catch:  their own dose of twin antics.  The young tutoree has an identical twin himself.  Having heard about Emma and Payton’s famous switch, Mason and Jason pull the same stunt on the girls, over and over again.  Texting, playing Wii and crushes will help draw middle school girls into the humorous storyline.