Matthew Sweet talks to Andrew Scull, author of Madness in Civilisation and Lisa Appignanesi about how different cultures around the world and through time have dealt with what we might call madness, insanity or the loss of reason. Matthew Beaumont also presents his history of an ancient crime but one still on the statute books of Massachussetts - Night Walking. Alongside, Deborah Longworth with a view of the flaneuse, the female solitary ambler and a pen-portrait of Dorothy Richardson whose relationship with the city of London outweighed all other passions in her life.