In this third book in the exceptional Curiosity House mystery series by bestselling author Lauren Oliver and mysterious recluse H. C. Chester, four children must uncover the evil Nicholas Rattigan’s newest dastardly scheme, wage war with a rival freak show, and deal with a spy who may have infiltrated their happy home.

Orphans Philippa, Sam, Thomas, and Max must find out who stole a valuable artifact in order to save to save their home, Dumfrey's Dime Museum of Freaks, Oddities, and Wonders.

Pippa, Sam, Thomas, and Max are happy to be out of harms way now that the notorious villain Nicholas Rattigan is halfway across the country in Chicago. But unfortunately their home, Dumfreyss Dime Museum of Freaks, Oddities, and Wonders, is in danger of closing its doors forever. But their troubles only get worse. The four friends are shocked when their beloved friend, famous sculptor Siegfried Eckleberger, is murdered. As they investigate, they find...