The answer was in the locked drawer. Amongst the reports in the newspaper clippings was one which read:
The personality of the man and his extraordinary power over women had been discussed at great length in the English papers at the time, together with an account of his excitability in court, his passionate protestations, and his occasional sudden ...
I believe it means "entrée" but I am not entirely sure why Agatha Christie wrote ongtray instead. Checking the meaning of "entrée":
The main course of a meal.
1.1 British A dish served between the first and main courses at a formal dinner.
The right to enter or join a particular sphere or group.
(2) fits the context.