There are 4 books by N. Sullivan on BookOrb. A strong starting point is The Man From Darke County (2014). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Showing 3 of 4 titles.
Frequently asked questions
How many books has N. Sullivan written?
BookOrb lists 4 books by N. Sullivan.
Where should I start with N. Sullivan?
A good starting point is The Man From Darke County (2014).
What is the N. Sullivan books in order list?
In publication order: 1. Spelology Caves & the Cave Environment (1997), 2. The Man From Darke County (2014), 3. Message of the genes.