With Mark Lawson, including a review of Identity, a new six part ITV drama starring Aidan Gillen and Keeley Hawes. The series follows an elite police unit formed to combat the explosion of identity-related crime. Mark goes behind the scenes at the National Gallery in London to find out how scientific investigations reveal hidden truths about art-works. We look back at the career of playwright and screenwriter Alan Plater whose death was announced today. And we have an interview with writer Catherine O'Flynn, winner of the Costa First Novel award in 2008, whose new novel focuses on a local TV news presenter in Birmingham. Producer Claire Bartleet.