Who ordered the murder of Jamal Khashoggi?

It’s a month to the day since Jamal Khashoggi walked into the Saudi consulate in Istanbul and disappeared.

Turkish investigators say a Saudi “hit squad” strangled the journalist in a premeditated attack, then dismembered and hid his body.

The Saudi story has changed repeatedly from saying he left the consulate safely to claiming it was an accidental killing to blaming rogue operators.

International pressure is mounting on the kingdom – with the US saying sanctions are on the way.

Al Jazeera looks at the murder of Khashoggi one month on; examining why the case has been so difficult to unravel and the important questions that are still unanswered.

Al Jazeera’s Alan Fisher reports.