The "Entity" relates to the special Vatican Secret Service agency that was founded in 1566. For five centuries, the Vatican has used a secret spy service, called the Holy Alliance, or later, the Entity, to carry out its will. Forty Popes have relied on it to carry out their policies. In her book Vilasi delves deep into the history of this agency and takes an in-depth look at its historical background, structure, and its main leaders. It also highlights some of the events related to the same history of the Church.