There are 2 books by Cathy O'Bryan on BookOrb. A strong starting point is Child of the Cold War (2020). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Cathy O'Bryan written?
BookOrb lists 2 books by Cathy O'Bryan.
Where should I start with Cathy O'Bryan?
A good starting point is Child of the Cold War (2020).
What is the Cathy O'Bryan books in order list?
In publication order: 1. Child of the Cold War (2020), 2. Leaving the Cold War Behind : Code Name (2023).