Unmasked: Anonymous historian leaked Islamic State secrets

He would wander the streets of occupied Mosul by day, chatting with shopkeepers and Islamic State fighters, visiting friends who worked at the hospital, swapping scraps of information. He grew out his hair and his beard and wore the shortened trousers required by the extremists. He forced himself to witness the beheadings and stonings, so he could hear executioners call out the names of the condemned and their supposed crimes.

By night, anonymously from his darkened room, Mosul Eye told the world what was happening. If caught, he too would be executed.

But after more than three years, his double life has grown too heavy to bear. He misses his name.