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Delphi Group Books in Order
Below you'll find the complete list of Delphi Group books in publication order. This is generally the recommended reading order for the series.
Reading order verified: March 2026
Quick Answer
What order should I read the Delphi Group series? Start with "The Signal" (2014) and follow publication order through all 8 books.
The complete Delphi Group reading order is listed below in publication sequence.
Publication Order
The Signal
2014
The Portal
2015
The Hades Conspiracy
2016
Betrayal
2017
The Island
2019
The Chamber
2020
The Anomaly
2021
The Ezekiel Code
2023
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