There are 1 book by Sam O'Brien on BookOrb. A strong starting point is Ruthless Gene (2021). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Sam O'Brien written?
BookOrb lists 1 book by Sam O'Brien.
Where should I start with Sam O'Brien?
A good starting point is Ruthless Gene (2021).
What is the Sam O'Brien books in order list?
In publication order: 1. Ruthless Gene (2021).