Darnley was Mary Stuart's husband but the marriage was an unhappy one and the Scottish nobles murdered Darnley. What if Darnley escaped or learnt of the murder plot? What if?
Well thats a difficult question. If Darnley escapes then what next? What happens to the nobles? Will Mary punish the conspirators? Will there be another attempt to kill him? Remember the Conspirators had most of the Nobles and ,possibility royal, approval. It was Mary's marriage to Bothwell that really did her in. Hell we might see Mary divorce him/ annul him instead. Or there could be another attempt, like with Andrew of Hungary and Joan of Naples or Lucrezia Boriga and Alfonso of Aragon.
Wouldn't Darnley suspect Mary though? While his murder was plotted, he plotted to usurp Mary at the same time. Still, hew had a rather deluded mind...