True crime, family secrets and hidden trauma

Journalist and best selling author Bob Kolker is a skilled practitioner at unearthing murky real-life dramas and transforming them into compelling reading. His first book, "Lost Girls", the story of a serial killer targeting prostitutes in Long Island, was acclaimed for its sympathetic take on the disappearance of America's discarded women. It is now a film on Netflix. Also on Netflix, the HBO film Bad Education, about a dashing, but embezzling school boss, was part inspired by a story he wrote for New York magazine. His latest book, "Hidden Valley Road", tells the tragic story of the Galvin family. Of 10 sons, six were diagnosed with schizophrenia. Bob tells Kathryn Ryan how they became the subject of study by researchers and how he came to pen their tale.