To celebrate the arrival of BBC One’s His Dark Materials, Obsessed With...Killing Eve's Zing Tsjeng brings you a special interview with Philip Pullman and Anne-Marie Duff, who plays Ma Costa, a boat-dwelling Gyptian.

Zing discovers the origin story of Lyra's daemon, how Anne-Marie brought the character of Ma Costa to life, and Phillip's process for creating the world we'll see on screen.