There are 2 books by Petrina Griffin on BookOrb. A strong starting point is Numbers in the Sea (2000). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Petrina Griffin written?
BookOrb lists 2 books by Petrina Griffin.
Where should I start with Petrina Griffin?
A good starting point is Numbers in the Sea (2000), based on reader ratings and series position on BookOrb.
What is the Petrina Griffin books in order list?
In publication order: 1. Numbers in the Sea (2000), 2. Sally Goes Swimming (Roly Poly Books) (2000).