Ian Caldwell books in order

Q: "How many books has Ian Caldwell written?"

"Ian Caldwell has written three books across two series."

Q: "What was Ian Caldwell's first book?"

"Ian Caldwell's first book is The Rule of Four, published in 2004."

Q: "What are Ian Caldwell's novels about?"

"Caldwell writes intellectual thrillers rooted in history and scholarship. The Rule of Four (2004), co-written with Dustin Thomason, is set at Princeton and involves a Renaissance text, while The Fifth Gospel (2015) takes place inside the Vatican and concerns a disputed ancient gospel."

Anthologies

Title	Published	Buy on Amazon
The Black Room Manuscripts: Volume One	2015	Buy

Standalone Novels

Title	Published	Buy on Amazon
The Rule of Four	2004	Buy
The Fifth Gospel	2015	Buy

Ian Caldwell is an American author who has written two novels, both of which combine scholarly puzzle-solving with thriller plotting. His debut, The Rule of Four (2004), was co-authored with Dustin Thomason and became a bestseller for its story of Princeton students attempting to decode a mysterious Renaissance manuscript.

His second novel, The Fifth Gospel (2015), took over a decade to write and is set in Vatican City, where a Catholic priest investigates a murder connected to a disputed ancient gospel. Both books reflect Caldwell’s interest in how old texts and hidden knowledge can have dangerous consequences in the present.

Frequently Asked Questions

How many books has Ian Caldwell written?

Ian Caldwell has written three books across two series.

What was Ian Caldwell's first book?

Ian Caldwell’s first book is The Rule of Four, published in 2004.

What are Ian Caldwell's novels about?

Caldwell writes intellectual thrillers rooted in history and scholarship. The Rule of Four (2004), co-written with Dustin Thomason, is set at Princeton and involves a Renaissance text, while The Fifth Gospel (2015) takes place inside the Vatican and concerns a disputed ancient gospel.

Anthologies#

Standalone Novels#

Frequently Asked Questions

Anthologies

Standalone Novels