Philippa Langley first took the world by storm when she discovered the grave of King Richard III (1452-1485) in a Leicester car park in 2012. The rediscovery and reburial of the last Plantagenet was watched by an estimated global audience of over 366 million. Now, she has turned her attention to the fate of the Princes in the Tower – a mystery that has fascinated and divided opinion for over 500 years.