The Grand Babylon Hotel by Arnold Bennett — Read

When, immediately after the episode of the bottle of Romanée-Conti in the State dining-room, Prince Aribert and old Hans found that Prince Eugen had sunk in an unconscious heap over his chair, both the former thought, at the first instant, that Eugen must have already tasted the poisoned wine. But a moment's reflection showed that this was not possible. If the Hereditary Prince of Posen was dying or dead, his condition was due to some other agency than the Romanée-Conti. Aribert bent over him, and a powerful odour from the man's lips at once disclosed the cause of the disaster: it was the odour of laudanum. Indeed, the smell of that sinister drug seemed now to float heavily over the whole table. Across Aribert's mind there flashed then the true explanation. Prince Eugen, taking advantage of Aribert's attention being momentarily diverted, and, yielding to a sudden impulse of despair, had decided to poison himself, and had carried out his intention on the spot.

The laudanum must have been already in his pocket, and this fact went to prove that the unfortunate Prince had previously contemplated such a proceeding, even after his definite promise. Aribert remembered now with painful vividness his nephew's words: "I withdraw my promise. Observe that -- I withdraw it. " It must have been instantly after the utterance of that formal withdrawal that Eugen attempted to destroy himself.