The chapter introduces several important actors: the Münsterlingen Psychiatric Clinic, its location and institutional context, the patients, the clinic staff, and the governing authorities. Special attention is paid to Roland Kuhn; his wife Verena Kuhn (née Gebhart), who was also a psychiatrist; his superior, clinic director Adolf Zollinger; and the development of the Swiss pharmaceutical companies in the first half of the twentieth century. It closes with a look at Parpanit, a Geigy substance intended to alleviate movement disorders that came to Münsterlingen in 1946 and initiated the serial testing of substances. The drug also marked the beginning of the close collaboration between Kuhn and Geigy.