For most of my adult life I've been fascinated by the mysterious inner worlds inside our heads, especially the shadow-side we hide, harbouring secrets, lies, vices and cover-ups. It was this perspective that culminated in work with ex-convicts from high-security institutions. I'm equally intrigued by the motives we have for doing what we do. It's partly what led me to work in psychotherapy, never thinking it could lead to a further career in fiction.