Before the multi-million, runaway bestseller The Da Vinci Code, Dan Brown set his razor-sharp research and storytelling skills on the most powerful intelligence organization on earth--the National Security Agency (NSA)--in this thrilling novel, Digital Fortress. When the NSA's invincible code-breaking machine encounters a mysterious code it cannot break, the agency calls its head cryptographer, Susan Fletcher, a brilliant and beautiful mathematician. What she uncovers sends shock waves through the corridors of power. The NSA is being held hostage...not by guns or bombs, but by a code so ingeniously complex that if released it would cripple U.S. intelligence. Caught in an accelerating tempest of secrecy and lies, Susan Fletcher battles to save the agency she believes in. Betrayed on all sides, she finds herself fighting not only for her country but for her life, and in the end, for the life of the man she loves. From the underground hallways of power to the skyscrapers of Tokyo to the towering cathedrals of Spain, a desperate race unfolds. It is a battle for survival--a crucial bid to destroy a creation of inconceivable genius...an impregnable code-writing formula that threatens to obliterate the post-cold war balance of power. Forever.

For the first time, all four Robert Langdon thrillers are now available as one ebook bundle. If you haven't read a Dan Brown yet, now's the time. ANGELS AND DEMONS The countdown to oblivion has started - who will stop the clock? A famous scientist is found dead, a mysterious symbol burned into his skin. Many miles away in Rome, the world’s cardinals gather to elect a new pope. Little do they know that beneath their feet, a vast bomb has started to tick. Professor Robert Langdon must work out the link between these two seemingly unconnected events if he is stop the Vatican being blown sky high. THE DA VINCI CODE The race to uncover the oldest secret has begun . . . An eminent man is brutally murdered in the world’s most famous museum. Around his body are a ring of codes, hastily drawn in blood. He died to protect a long-kept secret which Professor Robert Langdon must now uncover. It will be a race against time to decipher this final message. Can he get there before the killers do? THE LOST SYMBOL To save a life, you must first crack the code . . . A mysterious invitation brings Professor Robert Langdon to Washington DC. But all is not as it seems in this powerful city. An ancient organization plans to reassert itself. And he is the only man standing in its way. If he is to prevent a terrible plan being executed, Langdon must decipher a series of increasingly bloody clues. But first he has to make sure he stays alive . . . INFERNO The world is in danger - who will save it? Robert Langdon wakes up in a Florence hospital with no clue how he got there. But another attack on his life makes it very clear – someone wants him dead. And fast. To survive, Langdon must work out who it is. And then he must answer the next question – why?

“A tantalizing, timely thriller” (The Washington Post Book World) from the highly acclaimed author of Winter Work that offers a daring look at life behind the barbed wire of Guantánamo and a riveting portrayal of what goes on in the most secret levels of our government. When the body of an American soldier is discovered in Cuban waters near the U.S. detention facility at Guantánamo, Revere Falk, a former FBI agent, is reassigned from his job interrogating an accused al-Qaeda operative to investigate the soldier’s mysterious death. Falk soon finds himself in a deadly game of intrigue that stretches from the charged waters of Guantánamo Bay to the polished halls of Washington. Every move Falk makes could be costly, and to make matters worse, a dark figure from his past reappears, brandishing a secret he thought he had safely buried.

A former National Security Agency programmer threatens to release a mathematical formula that will allow organized crime and terrorism to skyrocket.

The murder of a world-famous physicist raises fears that the Illuminati are operating again after centuries of silence, and religion professor Robert Langdon is called in to assist with the case.

Marshall McLuhan was the greatest prophet of the digital age. In the 1960s, McLuhan, a Canadian literary theorist reared on Elizabethan satire and the labyrinthine novels of James Joyce, turned his attention toward the budding and befuddling electronic age. Like most prophets, McLuhan became one through a fascination with God. Prophets divine their wisdom from a source, and Digital Communion shows that McLuhan's was his own Catholic faith. In other words, the greatest prophet of the digital age was an ardent Christian. A reconsideration of his vision can change the way we view the online world. A Catholic convert, McLuhan foretold a digital age full of blessings and sins: a world where information was a phone call or keystroke away, but where our new global village could also bring out the worst in us. For him, mass media was a form of Mass. McLuhan thought that while the print world was visual, the electric world--especially television--was a medium of touch. It enveloped us. For McLuhan, God was everywhere, including in the electric light. Digital Communion considers the religious history of mass communication, from the Gutenberg Bible to James Joyce's literary forerunners of hypertextual language to McLuhan's vision of the electronic world as a place of potential spiritual exchange, in order to reveal how we can cultivate a more spiritual vision of the internet--a vision we need now more than ever.

Dwarf Fortress may be the most complex video game ever made, but all that detail makes for fascinating game play, as various elements collide in interesting and challenging ways. The trick is getting started. In this guide, Fortress geek Peter Tyson takes you through the basics of this menacing realm, and helps you overcome the formidable learning curve. The book’s focus is the game’s simulation mode, in which you’re tasked with building a dwarf city. Once you learn how to establish and maintain your very first fortress, you can consult the more advanced chapters on resource management and training a dwarf military. You’ll soon have stories to share from your interactions with the Dwarf Fortress universe. Create your own world, then locate a site for an underground fortress Equip your party of dwarves and have them build workshops and rooms Produce a healthy food supply so your dwarves won’t starve (or go insane) Retain control over a fortress and dozens of dwarves, their children, and their pets Expand your fortress with fortifications, stairs, bridges, and subterranean halls Construct fantastic traps, machines, and weapons of mass destruction