There are 1 book by Holly Wynne O'Brien on BookOrb. A strong starting point is Manhattan on Sundays (2016). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Holly Wynne O'Brien written?
BookOrb lists 1 book by Holly Wynne O'Brien.
Where should I start with Holly Wynne O'Brien?
A good starting point is Manhattan on Sundays (2016).
What is the Holly Wynne O'Brien books in order list?
In publication order: 1. Manhattan on Sundays (2016).