Chapter 6 focuses on fears of espionage and treachery, but also the extensive use of information and intelligence-gathering by all sides, and the fine distinctions between these. The close connection with ambassadors and their contacts is discussed, alongside how spies and spying were viewed by contemporaries, through correspondence and judicial records. Explores extensive fears of plots and foreign intervention and how this affected diplomatic and confessional relations; the execution of experienced courier, Jean Abraham, secretary to the prince of Condé, exemplifies this. Looks in detail at contemporary English concerns about a Franco-Scottish alliance in support of Mary Queen of Scots, making links from these concerns to the activities of Norris, cardinal Châtillon and to the network exposed by the letters carried by Tivinat. Attention is given to the role of female agents and especially to double agents, such as Edmund Mather, whose career and connections to Norris, Regnard/Changy and the wider network are explored in detail.