Chapter 2 looks at intelligence exchanges right after the Munich Olympics attack. This was when the Israeli government decided to go ahead with preparing the killing mission against any Palestinian involved in the planning and execution of the Munich massacre. This chapter shows how European intelligence helped Mossad identify the perpetrators of the attack, including those who planned and managed the terrorist operation as well as those who helped with the implementation or provided logistical support. European intelligence also helped Mossad to get a better sense of Black September’s operational methods in Europe, an area where Mossad lacked intelligence at the time. During this period, Black September carried out an explosive letters campaign, and this chapter shows how intelligence-sharing helped agencies detect the letters before they were opened. Lastly, through Club de Berne intelligence reports, numerous tactical details come to light about how Black September had organised the Munich Olympics attack.