There are 1 book by Sean (et al). O'Brien on BookOrb. A strong starting point is Phantoms at the Phil - The Third Proceedings (2007). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Sean (et al). O'Brien written?
BookOrb lists 1 book by Sean (et al). O'Brien.
Where should I start with Sean (et al). O'Brien?
A good starting point is Phantoms at the Phil - The Third Proceedings (2007).
What is the Sean (et al). O'Brien books in order list?
In publication order: 1. Phantoms at the Phil - The Third Proceedings (2007).