There are some excellent books that attempt to explain the complexity of TS. Some have been written by people with the condition (ie James McConnel, "Life Interupted"), some from the view of the concerned parent, and some by professionals in the field.
Isobel Heyman is a highly qualified medical expert working in several of the UK's top hospitals that run clinics for people with TS.
Perhaps her main success in writing this book is that she can draw from a wide range of personal experience, and then has the ability to convey her knowledge to those without any medical training.
Although she deals with the condition and those other conditions that often are associated with it, combined with an overview of the current thinking behind modern treatments, she is honest enough to explain just how very hard those with the condition may find it to obtain any degree of relief given the current state of medical knowledge.
At the same time, many readers will find it a comfort to read a book such as this that has been so obviously written by an expert with a deep sense of compassion for her patients.
I'd rate it has essential reading for anyone with an interest in the subject.