Nina tried to laugh, but it was a somewhat dismal effort.

“Come along!” said Archie cheerily.  “There’s my mother over there; she has been wondering where you were.”

Nina went with him with a nervous wonder if Hereford were still watching her, but she saw nothing of him.

The afternoon wore away in music and gaiety.  A great many of her acquaintances were present, and to Nina the time passed quickly.

She was sitting in a big marquee drinking the tea that Archie had brought her when she next saw her husband.  By chance she discovered him talking with a man she did not know, not ten yards from her.  The tent was fairly full, and the buzz of conversation was continuous.

Nina glanced at him from time to time with a curious sense of uneasiness, and an unaccountable desire to detach him from his acquaintance grew gradually upon her.

The latter was a heavy-browed man with queer, furtive eyes.  As Nina stealthily watched them she saw that this man was restless and agitated.  Her husband’s face was turned from her, but his attitude was one of careless ease, into which his big limbs dropped when he was at leisure.

Later she never knew by what impulse she acted.  It was as if a voice suddenly cried aloud in her heart that Wingarde was in deadly danger.  She gave Archie her cup and rose.

“Just a moment!” she said hurriedly.  “I see Hereford over there.”

She moved swiftly in the direction of the two men.  There was disaster in the air.  She seemed to breathe it as she drew near.  Her husband straightened himself before she reached him, and half turned with his contemptuous laugh.  The next instant Nina saw his companion’s hand whip something from behind him.  She shrieked aloud and sprang forward like a terrified animal.  The man’s eyes maddened her more than the deadly little weapon that flashed into view in his right hand.

There followed prompt upon her cry the sharp explosion of a revolver-shot, and then the din of a panic-stricken crowd.

But Nina did not share the panic.  She had flung herself in front of her husband, had flung her whole weight upon the upraised arm that had pointed the revolver and borne it downwards with all her strength.  Those who saw her action compared it later with the furious attack of a tigress defending her young.

It was all over in a few brief seconds.  Men crowded round and overpowered her adversary.  Someone took the frenzied girl by the shoulders and forced her to relinquish her clutch.

She turned and looked straight into Wingarde’s face, and at the sight her nerves gave way and she broke into hysterical sobbing, though she knew that he was safe.

He put his arm around her and led her from the stifling tent.  People made way for them.  Only their hostess and Archie Neville followed.

Outside on the lawn, away from the buzzing multitude, Nina began to recover herself.  Archie brought a chair, and she dropped into it, but she held fast to Wingarde’s arm, beseeching him over and over again not to leave her.