There are 1 book by Marius O'Brien on BookOrb. A strong starting point is Shoewalker (2010). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Marius O'Brien written?
BookOrb lists 1 book by Marius O'Brien.
Where should I start with Marius O'Brien?
A good starting point is Shoewalker (2010).
What is the Marius O'Brien books in order list?
In publication order: 1. Shoewalker (2010).