I was introduced around and was served a champagne cocktail. The first sip of the cocktail told me something was wrong, and I worked closer to the bar to find out what. Cecil Grantham, the son of the first husband, who was mixing, was committing worse than murder. I saw him. Holding a glass behind and below the bar top, he put in a half-lump of sugar, a drop or two of bitters, and a twist of lemon peel, filled it half full of soda water, set it on the bar, and filled it nearly to the top from a bottle of Cordon Rouge. Killing good champagne with junk like sugar and bitters and lemon peel is of course a common crime, but the soda water was adding horror to homicide. The motive was pure, reducing the voltage to protect the guests of honour, but faced with temptation and given my choice of self-control or soda water in champagne, I set my jaw. I was going to keep an eye on Cecil to see if he did to himself as he was doing to others, but another guest arrived and I had to go to be introduced. He made up the dozen.

By the time our hostess led the way through the arch and up the broad marble stairs to the dining-room on the floor above, I had them sorted out, with names fitted to faces. Of course I had previously met Robilotti and the twins, Cecil and Celia. Paul Schuster was the one with the thin nose and quick dark eyes. Beverly Kent was the one with the long narrow face and big ears. Edwin Laidlaw was the little guy who hadn’t combed his hair, or if he had, it refused to oblige.

I had had a sort of an idea that with the girls the best way would be as an older brother who liked sisters and liked to kid them, of course with tact and refinement, and their reactions had been fairly satisfactory.