There are 2 books by Holly O'Brien on BookOrb. A strong starting point is "Be Home by the Bells" (2014). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Holly O'Brien written?
BookOrb lists 2 books by Holly O'Brien.
Where should I start with Holly O'Brien?
A good starting point is "Be Home by the Bells" (2014).
What is the Holly O'Brien books in order list?
In publication order: 1. "Be Home by the Bells" (2014), 2. I'm Not Bipolar, I'm a Princess (2022).