Poskitt, Kjartan.

The secret life of codes / by Kjartan Poskitt ; illustrated by Ian Baker. - London : Scholastic, 2010. - 1 v. : ill. ; 20 cm. - Murderous maths .

9781407107158 (pbk.) : £5.99 1407107151 (pbk.) : £5.99

GBA992685 bnb


Ciphers--Juvenile literature.
Cryptography--Juvenile literature.
Ciphers
Cryptography

652 / .P675 2010 652 / .P675 2010 652.8