This text offers a detailed introduction to molecular biology, genetics, and neurobiology relevant to psychiatry. Generously illustrated chapters are organised to be read at both an introductory and at a more advanced level. Both beginners and advanced professionals should benefit from this text's discussion of how psychotropic drugs work and how gene-environment interactions may contribute to the pathogenesis of psychiatric disorders. The authors demonstrate how molecular investigations in psychiatry could revolutionise the field by leading to improved diagnostic testing, to new and more effective treatments, and ultimately to the development of preventive measures.