Book about the Caproni Ca.310 in Norway with emphasize on the history of the civilian used aircraft: LN-DAK “Brevduen”. It flew just three months for Det Norske Luftfartselskap, Fred. Olsen & Bergenske A/S (DNL) and operated on the Oslo – Gothenburg – Copenhagen night mail service. But beside its history the book will present the hunt by DNL for an aircraft for its mail services and the career of this aircraft in the Army Air Corps between 1938 and 1940. It has become a complete history of the type in Norwegian service.