A first-person memoir Callum wrote The Secrets of My Spectrum at just 16, sharing his own experiences of sensory overload, anxiety, education, friendships, communication and finding his own way. His experiences. His words. His perspective. The Secrets of My Spectrum became an Amazon #1 bestseller and has since been read by families, educators and autistic readers around the world. This is Callum's personal memoir and lived experience - not medical or clinical advice.