A while ago I wrote a book called Conundrum , which consists of 200 puzzles and ciphers - those who complete the entire book are entered in Conundrum's Hall of Fame, currently featuring just 17 impressive individuals worldwide. I occasionally set a bonus puzzle, open to all, with a free signed book as a prize.

This one comes in the form of a challenge requiring you to put together a number of different elements:

Passing under the seventh Duke, take the date of the crocodile, add the psalm number and divide by the verse to get the answer.

If you are up for the challenge, you can enter your solution on the website here (and see a couple of clues). One winning entrant will be chosen at random - entries to be in by the end of 28 February (GMT). 

Please don't append your entries here - only using the form on the website. I look forward to your suggestions: please do let me know how you got to the answer too in your entry.

You can buy my book Conundrum  from Amazon.co.uk, Amazon.com and Bookshop.org

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