Notes from Black Europe

What does it mean to be black in Europe? This week's guest Johny Pitts went on a five-month journey around the continent, interviewing black Europeans and exploring his own identity. The result is his brilliant new book, 'Afropean: Notes from Black Europe', which makes the case for a community that crosses borders. Also this week: the role of railways in the Holocaust; whether or not we should talk about Merkel; and a strange reward for good behaviour.