There are 1 book by Maria Morris O'Brien on BookOrb. A strong starting point is Beyond the Castle Doors (2007). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Maria Morris O'Brien written?
BookOrb lists 1 book by Maria Morris O'Brien.
Where should I start with Maria Morris O'Brien?
A good starting point is Beyond the Castle Doors (2007).
What is the Maria Morris O'Brien books in order list?
In publication order: 1. Beyond the Castle Doors (2007).