**'Title of Most Fiendish Book goes to Conundrum: Crack the Ultimate Cipher Challenge by the ever-excellent science writer Brian Clegg.' Daily Mail, Books of the Year**

The ultimate trial of knowledge and cunning, Conundrum features 200 cryptic puzzles and ciphers. The solutions link throughout the book – so you need to solve them all to get to the final round. 

With a focus on ciphers and codebreaking, Conundrum contains twenty sections, each built around a specific subject from music to literature, physics to politics. To take on Conundrum you need good general knowledge and the ability to think laterally. But if you need help, there are plenty of hints to point you in the right direction.

Whether you attempt to crack it alone or work in a team, Conundrum will challenge you to the extreme.

Can you take on Conundrum and win? There's only one way to find out…