Toto is a young girl who has relapsed leukemia, a form of cancer. She will receive CAR T-Cell therapy. Mumoo, a friend of Toto, wants to know more about CAR T-Cell therapy. Petey the Peacock, an expert in Medical Terminology, will be explaining everything to Mumoo in children's words. Rover the Racoon and Zozo the Zebra are scientists, and they are going to explain more about T-Cells, cancers, chemotherapy, and bone marrow transplants, as well as CAR T-Cell therapy in easy words with pictures. This book is designed to explain difficult cancer concepts to children in relatively easy words with child-friendly pictures. Cancer patients and their young friends and families will better understand the basics of cancer treatment by the end of this book.