ciphers

Using their code-breaking skills, four middle-schoolers solve the mystery of the eccentric man who draws stick figures on his second-floor bedroom window.

Photographs, illustrations, and text describe how math was used to decipher coded messages throughout history.

Thirteen-year-old Ruby, a genius code-cracker and daring detective, gets an anonymous call setting a challenge that leads her to the headquarters of Spectrum, a highly secret anti-crime agency that needs her help to crack a code, but soon Ruby uncovers dastardly plans of the Fool's Gold Gang.

Brad, Conor, and Scott are bored until they find a briefcase containing a cell phone number that leads them on an adventure, following one clue after another until they find a treasure in a cave--but can they find their way out again?.

An introduction to the world of codes and how to write and break them.

Discusses different methods for speaking secret codes and describes spoken codes from throughout history.

The discovery of a bottle containing a coded message leads two boys to a new friend with whom they form a club.

Using their code-breaking skills, four middle-schoolers solve the mystery of the eccentric man who draws stick figures on his second-floor bedroom window.

Examines the use and breaking of codes throughout history featuring many color illustrations. Covers codes from hieroglyphs to DNA, graffiti, the Zodiac Killer, and "The Da Vinci Code.".

For her tenth birthday, Rosemary Rita's grandmother Mimi sends her a magical hourglass, which takes Rosemary Rita back to 1870 in Germany to meet Mimi's great grandmother and help her decode a mysterious postcard.