Which is the only letter of the alphabet not to appear in the name of any US state?

Can YOU solve the Puzzle for Today?

Tackle the conundrums that have been frustrating and confounding the nation on Radio 4's Today programme.

The Today Programme Puzzle Book challenges you with over 250 tricky brainteasers designed by the greatest puzzles masters around the world. The book includes: Celebrity Riddles, Christmas Crackers, Common Sense Conundrums, Flags, Capitals & Nations Puzzles and Fiendish Numerical Problems. Challenge your grey matter and hone your reasoning and logic skills with the brainteasers that manage to get the nation's synapses firing every morning.

With a foreword from Sarah Sands, the editor of the Today programme, and introductions from the BBC's science editor.

Featuring Puzzles from Mensa, University of Cambridge, UK Mathematics Trust, Japanese puzzle masters & many more.

[Answer: The letter Q]