There are 3 books by Gary O'Callaghan on BookOrb. A strong starting point is G. O. Fishin' (2013). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Showing 2 of 3 titles.
Frequently asked questions
How many books has Gary O'Callaghan written?
BookOrb lists 3 books by Gary O'Callaghan.
Where should I start with Gary O'Callaghan?
A good starting point is G. O. Fishin' (2013).
What is the Gary O'Callaghan books in order list?
In publication order: 1. The castle murders (1998), 2. G. O. Fishin' (2013).