Street Hunt is a new hunt based in Norwich UK which launches on 6th May 2011.

The website describes the hunt as
A visual crossword puzzle, a treasure hunt where the riches are road names, a story emerging from the page and your chance to win up to 10,000
You have to buy the book to participate in the hunt which must be picked up in person from The Book Hive (a bookshop) in Norwich.

Full details here:

Street Hunt