What is the order of shadow children books?

The Shadow Children series by Margaret Peterson Haddix is in chronological order:

1. The Shadow Children (1998)

2. The Shadow Twins (1999)

3. The Shadow Speaker (2000)

4. The Shadow Thief (2001)

5. The Shadow Outlaws (2002)

6. The Shadow Puppets (2003)

7. The Shadow War (2004)

8. The Shadow Queen (2005)

There is also a prequel novel:

* The Shadow Diaries (2017)

This prequel takes place before the events of the main series and tells the story of how the first Shadow Children came to be.