"Mary Russell and Sherlock Holmes, hoping for a respite in the French countryside, are instead caught up in a case that turns both bewildering and intensely personal. After their recent adventures in Transylvania, Russell and Holmes look forward to spending time with Holmes' son, the famous artist Damian Adler, and his family. But when they arrive at Damian's house, they discover that the Adlers have fled from a mysterious threat. Holmes rushes after...

Traces the history of coding and the use of secret codes, and teaches readers how to send their own secret messages

One by one, distress calls start coming in from around the globe. Cahills are being kidnapped by a shadowy group known only as the Vespers. Now Amy and Dan have only days to fulfill a bizarre ransom request or their captured friends will start dying.

When a second-rate cage fighter, Luke Wright, is tormented by the Russian Mafia and wanders the streets of New York, he witnesses a young Chinese girl, Mei, being pursued by the same mafia who want her for a priceless numerical code that they would kill for.

When Amy and Dan Cahill's quest to find the million dollars takes them to Japan, they must decide whether or not to enter into an alliance with their uncle, Alastair Oh, whose motives for helping them are extremely questionable.

Amy and Dan Cahill hit the high seas as they follow the trail of some infamous ancestors to track down a long lost treasure. However, the real prize isn't hidden in a chest. It's the discovery of the Madrigals' most dangerous secret and, even more shockingly, the true identity of the mysterious man in black.

"Cryptology is the art and science of secret communication, and its purpose is to protect precious information and keep people safe. Learn about its building blocks: ciphers, codes, and keys"--

Provides information on steganography, the art of concealing messages in plain sight, discussing invisible inks, the Cardano Grille, the use of microdots in WWI, and the butterfly maps of Lord Baden-Powell.

657 days ago Meg's British father left their home in France to fight the Nazis, leaving some codes in a jar for her to decipher, and Meg and her French mother moved to the Perche, a region in France near Normandy known for its forests; now Meg watches the German soldiers in town, and sometimes carries messages for the French resistance--but suddenly things have gotten much more dangerous: there is a wounded British officer hiding in her grandmother's...

A young woman who hopes to give up her bartending job to become a successful writer, Ivy Seidel falls under the spell of Vance Harrow, convicted for a terrible crime, while teaching writing to inmates at a maximum security prison.