Trouble Under Oz is a 2006 novel by Sherwood Smith, illustrated by William Stout and published by HarperCollins.

[1] Dori and Em, Dorothy Gale's modern-day descendants from the previous book, return in this second installment.

Dori travels to Oz in answer to a summons from Princess Ozma, while Em remains behind to deal with their parents' impending divorce.

The adventurers must defeat an Iron Giant and confront monsters on their way; they meet mermaids and invisible children.

This article relating to "The Wonderful Wizard of Oz" or one of its derivative works is a stub.