There are 2 books by Cian O'Carroll on BookOrb. A strong starting point is Brendan O'Regan (2018). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Cian O'Carroll written?
BookOrb lists 2 books by Cian O'Carroll.
Where should I start with Cian O'Carroll?
A good starting point is Brendan O'Regan (2018).
What is the Cian O'Carroll books in order list?
In publication order: 1. Brendan O'Regan (2018), 2. Knappogue.