The book safe ad

A spy themed campaign for Lava publishers and their book “Den Sakkunnige”. The book, which is written under a pseudonym, is a tell all story about dirty Swedish political secrets not known to all. In order to raise awareness, the book has been locked up in a safe in an ad shell in front of the Swedish parliament. People worthy enough to solve the cipher written in the ad can open the safe and get a free copy of the book.