Trouble Under Oz is a 2006 novel by Sherwood Smith

Sherwood Smith

Sherwood Smith writes fantasy and science fiction for young adult as well as adults. She has participated in and organized writing groups for many years.Smith's works include the YA novel Crown Duel...

, illustrated by William Stout

William Stout

William Stout is an American fantasy artist and illustrator with a specialization in paleontological art. His paintings have been shown in over seventy exhibitions, including twelve one-man shows. He has worked on over thirty feature films, doing everything from storyboard art to production design...

 and published by HarperCollins

HarperCollins

HarperCollins is a publishing company owned by News Corporation. It is the combination of the publishers William Collins, Sons and Co Ltd, a British company, and Harper & Row, an American company, itself the result of an earlier merger of Harper & Brothers and Row, Peterson & Company. The worldwide...

. It is a sequel to Smith's 2005 novel The Emerald Wand of Oz

The Emerald Wand of Oz

The Emerald Wand of Oz is a 2005 book by Sherwood Smith and is a continuation of the Oz series that was started by L. Frank Baum in 1900. The book is illustrated by William Stout and published by HarperCollins....

and a further continuation of the Oz series originally started by L. Frank Baum

L. Frank Baum

Lyman Frank Baum was an American author of children's books, best known for writing The Wonderful Wizard of Oz...

 in 1900.

Dori and Em, Dorothy Gale

Dorothy Gale

Dorothy Gale is the protagonist of many of the Oz novels by American author L. Frank Baum, and the best friend of Oz's ruler Princess Ozma. Dorothy first appears in Baum's classic children's novel The Wonderful Wizard of Oz and reappears in most of its sequels...

's modern-day descendents from the previous book, return in this second installment. Dori travels to Oz

Land of Oz

Oz is a fantasy region containing four lands under the rule of one monarch.It was first introduced in The Wonderful Wizard of Oz by L. Frank Baum, one of many fantasy countries that he created for his books. It achieved a popularity that none of his other works attained, and after four years, he...

 in answer to a summons from Princess Ozma

Princess Ozma

Princess Ozma is a fictional character in the Land of Oz, created by L. Frank Baum. She appears in every book of the series except the first, The Wonderful Wizard of Oz .She is the rightful ruler of Oz, and L...

, while Em remains behind to deal with their parents' impending divorce. Ozma asks Dori to travel with Prince Inga

Rinkitink in Oz

Rinkitink in Oz: Wherein is Recorded the Perilous Quest of Prince Inga of Pingaree and King Rinkitink in the Magical Isles that Lie Beyond the Borderland of Oz. is the tenth book in the Land of Oz series written by L. Frank Baum. Published on June 20, 1916, with full-color and black-and-white...

 to the Nome Kingdom; there they will aid Prince Rik to take control of the throne and avoid a war. The adventurers must defeat an Iron Giant and confront monsters on their way; they meet mermaids and invisible children.

Smith uses characters and locations from several Baum books, including Ozma of Oz

Ozma of Oz

Ozma of Oz: A Record of Her Adventures with Dorothy Gale of Kansas, the Yellow Hen, the Scarecrow, the Tin Woodman, Tiktok, the Cowardly Lion and the Hungry Tiger; Besides Other Good People too Numerous to Mention Faithfully Recorded Herein published on July 30, 1907, was the third book of L....

, Dorothy and the Wizard in Oz

Dorothy and the Wizard in Oz

Dorothy and the Wizard in Oz: A Faithful Record of Their Amazing Adventures in an Underground World; and How with the Aid of Their Friends Zeb Hugson, Eureka the Kitten, and Jim the Cab-Horse, They Finally Reached the Wonderful Land of Oz is the fourth book set in the Land of Oz written by L....

, The Emerald City of Oz

The Emerald City of Oz

The Emerald City of Oz is the sixth of L. Frank Baum's fourteen Land of Oz books. It was also adapted into a Canadian animated film in 1987. Originally published on July 20, 1910, it is the story of Dorothy Gale and her Uncle Henry and Aunt Em coming to live in Oz permanently...

, Tik-Tok of Oz

Tik-Tok of Oz

Tik-Tok of Oz is the eighth Land of Oz book written by L. Frank Baum, published on June 19, 1914. The book actually has little to do with Tik-Tok and is primarily the quest of the Shaggy Man to rescue his brother, and his resulting conflict with the Nome King.The endpapers of the first edition...

and Rinkitink in Oz

Rinkitink in Oz

Rinkitink in Oz: Wherein is Recorded the Perilous Quest of Prince Inga of Pingaree and King Rinkitink in the Magical Isles that Lie Beyond the Borderland of Oz. is the tenth book in the Land of Oz series written by L. Frank Baum. Published on June 20, 1916, with full-color and black-and-white...

.