Dean Baquet, the executive editor of The Times, discusses where “Caliphate” failed to meet Times standards. And Mark Mazzetti, an investigative correspondent for The Times, details new reporting that casts significant doubt on the claims of a central figure in the series. Editors' Note: The...

Slavery was enmeshed in the theology of ISIS. Rukmini speaks to an ISIS detainee who challenges her to find the girl he enslaved. She does.