There are 1 book by Oscar O'Brien on BookOrb. A strong starting point is Investments in 2 Days (2015). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Oscar O'Brien written?
BookOrb lists 1 book by Oscar O'Brien.
Where should I start with Oscar O'Brien?
A good starting point is Investments in 2 Days (2015).
What is the Oscar O'Brien books in order list?
In publication order: 1. Investments in 2 Days (2015).