Callie Martinez-Silva is finally getting the hang of this whole goddess within thing. Six months after learning she was one of the nine muses of ancient myth, she and the other kid-muses are ready for new adventures. Except first Callie has to go to New York City for the summer to visit her dad, stepmom, and new baby brother. Then the Muses get startling news: an unprecedented TENTH muse has been awakened somewhere in Queens, putting Callie in the perfect position to help find her. And she’ll have help—thanks to a runaway mold problem in London, Muse Headquarters is moving to the New York Hall of Science. But balancing missions and family-mandated arts camp proves difficult for Callie, especially once mysterious messages from spiders (yikes!) begin to weave a tale of ancient injustice involving Callie’s campmate, Ari.