"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! It's no surprise that Harley can't 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, it's coming to Earth! But as things get stranger, Harley knows how to get to the bottom of a mystery--and...

When girls in Gotham City go missing, Harley Quinn is determined to track down their kidnapper. But the only way to outsmart a villain is to engage in a little villainy herself. Don't miss the adrenaline-racing conclusion to the Harley Quinn trilogy.