Chapter 1 provides a detailed analysis of the interrogation document and what it reveals to us about, and as far as possible what can be verified regarding, Tivinat’s activities as a merchant and courier operating between France and England. The process of interrogation and the interests of the interrogator are also explored. In particular, examines Tivinat’s relationship with the household of the cardinal of Châtillon and identifies those to whom and from whom the letters were sent and the clandestine world in which these contacts were made. Other contemporary examples of similar interceptions are discussed to establish how typical or otherwise this case is and what they collectively tell us about the frequency and precarity of such communication. Above all, the necessity of identifying Tivinat’s supplier, Changy, is emphasised and undertaken at length, establishing that he was Hugues de Regnard, a Huguenot minister with well-established and widespread transnational connections with Calvinist church and noble leaders in several countries.