Barry Unsworth on his last novel The Quality of Mercy

The Booker-winning novelist Barry Unsworth, who has died in Italy at the age of 81, recorded this interview for the Guardian Books Podcast on publication of his final novel, The Quality of Mercy. He tells Sarah Crown how he always wanted to write a sequel to Sacred Hunger, which gave a voice to the slaves who were thrown overboard by the brutal slavers of the Liverpool Merchant.