Is there a fifth mistmantle chronicles book?

There is not currently a fifth book in the Mistmantle Chronicles series by Shannon Hale.

The series currently consists of four books:

1. The Goose Girl (2003)

2. Enna Burning (2005)

3. The River of Souls (2008)

4. The Unremembered (2011)

While there are no official announcements for a fifth book, there is always the possibility of a new book in the future. However, it's important to remember that authors often move on to new projects.