Caldwell and Thomason have created a stunning first novel; a perfect blend of suspense and a sensitive coming of age story. If Scott Fitzgerald, Umberto Eco, and Dan Brown teamed up to write a novel, the result would be THE RULE OF FOUR. An extraordinary and brilliant accomplishment - a must read."
--- Nelson DeMille

"This debut packs all the esoteric information of The Da Vinci Code ... with lovely writing reminiscent of Donna Tartt's The Secret History.... A compulsively readable novel."
--- People, Critic's Choice/4 stars

"As much a blazingly good yarn as it is an exceptional piece of scholarship ... a smart, swift, multitextured tale that both entertains and informs."
--- San Francisco Chronicle

"Profoundly erudite ... the ultimate puzzle book."
--- The New York Times Book Review

"[An] intriguing intellectual suspense novel."
--- Publishers Weekly, starred review

"If you have a taste for puzzle-solving ... you'll be rewarded."
--- San Jose Mercury News

"An impressive debut, a coming-of-age novel in the guise of a thriller, packed with history (real and invented) and intellectual excitement."
--- Booklist

"Astonishingly good ... intricate, erudite, and intensely pleasurable."
--- Kirkus Reviews, starred review

"Riveting, poignant, and intensely intimate, THE RULE OF FOUR is a thinking person's thriller of the highest order."
--- Bookpage