Watch The Secret (2021) : Full Movie Online Free A new Icelandic documentary by Björn B. Björnsson. In 1973, a police investigation was carried out into who had stolen one of the most valuable envelopes in the world from Kiðjaberg in Grímsnes. This envelope, with many rare stamps, is called the Bible Letter, which is owned by the Swedish Count today. The police did not begin to disclose the case at the time, but in the film, a stamp buyer finally reveals the secret behind who was behind the sale of the letter from the country. The secret is a film about an investigation that informs about this old criminal case.