Harley Quinn investigates a cosmic carnival in this action-packed new DC Super Hero Girl novel! Funny girl Harley Quinn loves fighting crime with her classmates like Wonder Woman, Batgirl, and Supergirl, but she always does it her with own madcap style and a big mallet! Its no surprise that Harley cant resist getting involved with an upcoming inter-school battle of the bands and a fantastic cosmic carnival that appears only once a year and this year, its coming to Earth! But as things get stranger, Harley knows how to get to the bottom of a mystery and deliver a great punch line while doing it!