There are 4 books by Thomas O'Callaghan on BookOrb. A strong starting point is The Screaming Room (2007). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Thomas O'Callaghan written?
BookOrb lists 4 books by Thomas O'Callaghan.
Where should I start with Thomas O'Callaghan?
A good starting point is The Screaming Room (2007).
What is the Thomas O'Callaghan books in order list?
In publication order: 1. Names of Victorian railway stations (1918), 2. The Screaming Room (2007), 3. No One Will Hear Your Screams (2020), 4. Bone thief (2020).