Holyoke, Polly
Chronological Checklist
- The Neptune Project (New York: Hyperion Books, 2013)
- The Neptune Conspiracy (London: Puffin Books, 2014)
- The Neptune Challenge (New York: Hyperion Books/Disney, 2015)
- The Neptune Promise (place not given: Holyoke Books, 2017)
- Skyriders (New York: Viking Books for Young Readers, 2023)
- The Sky King (New York: Viking Books for Young Readers, 2024)