Islamic State, or ISIS, has lost 98% of its territory in Iraq and Syria. But it persists, and even as its enemies declare victory, recent fatal attacks across the world, from New York to Kabul, remind us of the threat it still poses.

Rukmini Callimachi is a three-time Pulitzer-nominated reporter covering terror groups for The New York Times. She talks to Chris Dooley about how she got into her unusual and sometimes dangerous line of work, the state of ISIS in 2018 and the logic behind the organisation's behaviour.