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Persons Unknown by Susie Steiner Read the opening extract of the brand new Susie Steiner book before its publication on 05/04/2018

The Rule of Four by Ian Caldwell and Dustin Thomason

The Rule of Four

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Dubbed ‘The Davinci Code for people with brains’ by the Independent. The book centres on a 15th-Century manuscript and a bunch of American students and scholars bent on cracking its mysterious code and finding a hidden crypt. A definite winner

If you like Ian Caldwell and Dustin Thomason you might also like to read books by Carlos Ruiz Zafon and Jon Fasman.

Win Books from the Manon Bradshaw Thriller Series!

Persons Unknown, the second book in Susie Steiner's crime thriller series, is now out in paperback and to mark the publication we are giving away paperback copies of both Missing, Presumed and Persons Unknown to THREE lucky winners!

To have a chance of winning one of these fantastic prizes, click the button below. Please note that this draw is open only for UK residents and is free to enter, multiple entries from the same email address will only be counted once.

The draw closes on 30 April 2018. The winners will be notified by 14 May 2018,

Good luck!

Enter prize draw Draw closes: 30/04/2018


The Rule of Four by Ian Caldwell and Dustin Thomason

Tom Sullivan is about to graduate from Princeton. He's intelligent and popular, but haunted by the violent death several years earlier of his father, an academic who devoted his life to studying one of the rarest, most complex and most valuable books in the world. Since its publication in 1499, the Hypnerotomachia Poliphili has baffled scholars who have tried to understand its many mysteries. Coded in seven languages, the text is at once a passionate love story, an intricate mathematical labyrinth, and a tale of arcane brutality. Paul Harris, Tom's roommate, has deeply personal reasons of his own for wanting to unveil the secrets the book hides.

When a long-lost diary surfaces, it seems the two friends have found the key to the labyrinth - but when a fellow researcher is murdered only hours later, they suddenly find themselves in great danger. And what they discover embedded in the text stuns them: the passion of a Renaissance prince, a hidden crypt, and a secret worth dying to protect.

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" assured piece of fiction that weaves together the past and the present seamlessly. I enjoyed it tremendously." Peter Guttridge Observer

"An extremely erudite thriller" The New York Times

"Prepare for an engrossing read..." Eve

About the Author

Ian Caldwell and Dustin Thomason
Ian Caldwell was Phi Beta Kappa in History at Princeton University. Dustin Thomason won the Hoopes Prize at Harvard University. The two have been best friends since they were eight years old. They began writing The Rule of Four after graduating in 1998.

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Book Info

Publication date

6th June 2013


Ian Caldwell and Dustin Thomason

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544 pages


Action Adventure / Spy
Thriller / Suspense
eBook Favourites

Modern & contemporary fiction (post c 1945)



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