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Neptune — by Polly Holyoke
The Neptune Series in Order (2 Books)
| Order | Book | Date | Rating | |
|---|---|---|---|---|
| 1 | The Neptune Project | May-2013 | 5 |  |
| 2 | The Neptune Challenge | May-2015 | 5 | |
Frequently Asked Questions (FAQ)
There are 2 books in the Neptune series.
The Neptune series does not have a new book coming out soon. The latest book, The Neptune Challenge (Book 2), was published in May 2015.
The first book in the Neptune series, The Neptune Project, was published in May 2013.
The Neptune series primarily falls into the Action Adventure genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.