A thorough look at the current research on trauma with a focus on non-pharmaceutical treatments. Due to the nature of the field it is littered with some truly horrific records of what some of his patients have suffered through, so be careful if you are sensitive to that sort of thing.
The key insight is that traumatic experiences can fundamentally change your biochemistry and neurology, but there are an array of techniques that can help mitigate this, from well established activities like martial arts, yoga, meditation and theatre through to more novel techniques like EMDR.
It has the common flaw for these sorts of books where everything is seen through the lens of trauma and other fields are dismissed or minimised but as long as you come to it with a critical mind there's still a lot to be gleaned here.