Win: The Story of Codes
Published to coincide with the 100th anniversary of GCHQ, The Story of Codes traces the makers and breakers of secret communications, from Ancient Egypt to the 21st century.
To be in with a chance of winning a copy, just send your name, address and organisation/institution to firstname.lastname@example.org by October 31.
Stephen Pincock and Mark Frary
Published by Modern Books
Hardback RRP £19.95