Lying between the makeshift graves is a mattress, a large bloodstain visible in the midday sun. A name is scrawled in Arabic on its ragged fabric: Mohammed Adam.
Who was Adam? Had he ended up here, in a bleak corner of a remote military installation in Sudan’s Khartoum state? Had his body been stretchered on the mattress from the detention centre nearby and dumped into one of hundreds of unmarked graves?