"First published in 2019 by Scholastic Australia, an imprint of Scholastic Australia Pty Limited." --Title page verso. Series numeration from Amazon.com.
Summary:
"Something very WEIRD is going on at school. Ella's second-best BFFs keep WHISPERING super secretively in class and DISAPPEARING at lunchtime. Ella tries to get to the bottom of the mystery, but it seems that everyone's lips are completely ZIPPED. Then one day, Ella finds a fancy envelope on her desk with an invitation to join SOAP, the Secret Organization for Amazing People..." -- Back cover.
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