There are 1 book by R D. O'Brien on BookOrb. A strong starting point is Darjeeling (2002). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has R D. O'Brien written?
BookOrb lists 1 book by R D. O'Brien.
Where should I start with R D. O'Brien?
A good starting point is Darjeeling (2002).
What is the R D. O'Brien books in order list?
In publication order: 1. Darjeeling (2002).