Ionna Iordanou’s book deals with the Venetian intelligence in political, socio-economic and organizational aspects and aims to prove that the Venice Secret Service is one of the world's earliest central and systematic intelligence services. In the introduction part of the book, basic information is given about the Council of Ten and the State Inquisitors which had an important role in the functioning of the Venetian intelligence. Also in this part, the author states that the date range of 1500- 1630, in which the Council of Ten played a pivotal role in the creation of the Venice Secret Service, is the main chronological focus of the book.