There are 3 books by Walker O'Brien on BookOrb. A strong starting point is The Apocalypse Agenda (2000). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Walker O'Brien written?
BookOrb lists 3 books by Walker O'Brien.
Where should I start with Walker O'Brien?
A good starting point is The Apocalypse Agenda (2000).
What is the Walker O'Brien books in order list?
In publication order: 1. The Apocalypse Agenda (2000), 2. The Chu Chi Chronicles (2002), 3. The Empire of the Dead (2003).