Frank Close will explore the murky waters of cold war espionage, physics,the bomb and the role of Cotswold housewife “Agent Sonya”. “Trinity” was the codename for the test explosion of the atomic bomb in New Mexico on 16 July 1945. Trinity is now also the extraordinary story of the bomb’s metaphorical father, Rudolf Peierls; his intellectual son, the atomic spy, Klaus Fuchs, and the ghosts of the security services in Britain, the USA and USSR.