It's almost Halloween, and Kaz and Claire are off to Seattle to visit Claire's cousins. They explore the local library...and find a ghost living there! The ghost's family has been missing, so Kaz and Claire decide to investigate. When they discover ghostly activity in the city's subterranean passages, they put their detective skills to work. Kaz and Claire are on the case!

This book has been graded for interest at 6-8 years.

There are 192 pages in this book. This book was published 2017 by Penguin Putnam Inc .

Dori Hillestad Butler began her published career writing for magazines, with stories in Highlights for Children, Children's Digest, and Child Life. She was also a ghostwriter for the popular Sweet Valley Twins Series and continues to ghostwrite for the Boxcar Children Series. She has written numerous children's and middle-school books since, and several of her books appear on the IRA's Children's Choice lists in ten different states. She resides in Coralville, Iowa. Joan C. Waites has illustrated over thirty-five books for the educational and trade marketplace, including two previous books for Pelican: Moon's Cloud Blanket and The Waving Girl. Waites lives and works in Silver Spring, Maryland, with her husband, Gerard, and their three children.