Poirot reveals what led him to his theory: the ink was contained in a bottle of nail polish he noticed in Linnet's cabin; Simon reloaded the gun with two spare cartridges before he disposed of it, as Poirot realized that three shots were fired that night; the stole was used to silence the gun when Simon shot his own leg; Poirot suspected premeditation for the murder, because he slept deeply through that night's events – he had been drugged through his wine that evening.