Order of Book Series
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Delphi Group Books in Order

Delphi Group by John Sneeden contains 8 books, published between 2014 and 2023. The first book is The Signal (2014) and the newest is The Ezekiel Code (2023). Publication order is the reading order below.

Books
8
Published
2014–2023
See all 8 books in order Printable Delphi Group checklist

Delphi Group is a John Sneeden series about a secret government agency of that name that investigates and fights paranormal threats. Each book sends the agents on a new mission into dangerous, supernatural territory. The Signal (2014) opens the 8-book run, which includes The Portal, The Hades Conspiracy and The Chamber and reaches The Ezekiel Code (2023).

How many Delphi Group books are there?

Delphi Group has 8 books, released between 2014 and 2023.

Delphi Group Books in Publication Order

The table lists all 8 Delphi Group books in the order they were published, with the release year and how many independent book listings confirm each title. Catalogue data as of September 2026.

  1. Cover of The Island by John Sneeden, book 5 of the Delphi Group series (2019)
  1. 1
    The Signal2014 · confirmed 1/4
    2014–
    Buy at Amazon USAmazon UK
  2. 2
    The Portal2015 · confirmed 1/4
    2015–
    Buy at Amazon USAmazon UK
  3. 3
    The Hades Conspiracy2016 · confirmed 1/4
    2016–
    Buy at Amazon USAmazon UK
  4. 4
    Betrayal2017 · confirmed 1/4
    2017–
    Buy at Amazon USAmazon UK
  5. 5
    The Island2019 · confirmed 1/4
    2019–
    Buy at Amazon USAmazon UK
  6. 6
    The Chamber2020 · confirmed 1/4
    2020–
    Buy at Amazon USAmazon UK
  7. 7
    The Anomaly2021 · confirmed 1/4
    2021–
    Buy at Amazon USAmazon UK
  8. 8
    The Ezekiel Code2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK

Is there a chronological order for Delphi Group?

No separate chronological order is on record for Delphi Group, because none of the book listings this catalogue draws on publishes one; the publication order above is the only order given.

Do you have to read Delphi Group books in order?

You should read the Delphi Group books in publication order, the order of the numbered table above. The catalogue does not record whether each Delphi Group book also stands alone.

Where to start with Delphi Group

Start with The Signal (2014), the earliest published title.

What is the newest Delphi Group book?

The Ezekiel Code (2023) is the newest Delphi Group book released so far.

Is there a new Delphi Group book coming?

No next Delphi Group book is announced in the catalogue, which is a gap in the listings it merges rather than a sign that the run has ended.

Delphi Group at a glance

Paused
No new Delphi Group title has appeared for 3 years. The last was published in 2023.
Release pace
Delphi Group books have appeared about one a year on average.
Busiest decade
Most Delphi Group books, 5 of 8, were published in the 2010s.

More books by John Sneeden

The author page linked below lists every book in publication order.