Immunotherapy is one of the newest, promising areas that improve the quality of life of patients with serious diseases. Why do adherents of drug therapy question its effectiveness, despite obvious successes? Indeed, can the body really heal itself from cancer, dementia or multiple sclerosis? And if it can, then why doesn't it? This book will take you on a fascinating journey through the world of medical discovery. Together with patients and pioneering scientists, you will learn how our immunity works, what will help activate it and why an overactive immune system is so scary. Real detective stories mixed with a thriller and sometimes, science fiction - this is how you can evaluate the path of doctors who, throughout their lives, tried to decipher the riddles posed to people by such a familiar and so incredibly complex human body. The book is based on discoveries for which the Nobel Prize in Physiology or Medicine was awarded in 2018.