“Who was he?”

“Nobody round here knows a thing about him.  He shot himself through the heart and us sleeping here an’ not knowing anything at all about it.”

“But didn’t any one know who he was?”

“Never a soul.  The superintendents from all the buildings round took a look at the body, but none of them knew him.  It wasn’t anybody that lived around here.  There’s a piece in the afternoon papers about it.”

“Get me a paper at once,” directed the girl.

Eagerly she read the paragraph the maid pointed out.  It really told very little.  The body of a plainly dressed man had been found on the sidewalk.  There was a revolver in his hand with one cartridge discharged, and the bullet had penetrated his heart.  He had been a short stalky man and had worn a brown soft hat.  There was nothing about his clothing to identify him, even the marks where his suit had been purchased having been removed.  He had not been identified.  The police and the coroner were satisfied that it was a case of suicide.

Suicide!

Jane, reading and rereading the paragraph, recalled the unusual occurrence she had witnessed the night before.  Vividly there stood out before her the strange panorama she had seen, the tall young man in evening clothes, and the short stalky man with the soft hat who had followed him.  The two of them had run around the corner.  Only one of them had come back.  Unforgettably there was imprinted in her memory the satanic expression on the young man’s face as he had hastened into the house.  No wonder he had cast such an anxious glance behind him as he entered.

Suicide!

Jane was certain that it was no suicide.  She remembered the curious thud she had heard from around the corner, like a body falling to the pavement.  She recalled that it must have been at least ten minutes before the other man reappeared, time enough to have placed the revolver in the dead man’s hand, time enough even to have removed all possible means of identification from the man’s clothing.

It was not suicide, Jane felt certain.  It was murder!  Slowly but oppressingly, overwhelmingly, it dawned on her not only that in all probability a murder had been committed, but also that she—­more than likely, she alone in all the world—­knew who the murderer was, who it must have been—­the young man next door.

CHAPTER II

THE ADDRESS ON THE CARD

Impatiently Jane looked at her wrist watch.  It lacked an hour of the time when she was to meet her mother at the Ritz for tea.  Her nerves still all ajangle from excitement and worry over the morning’s tragedy, and her own accidental secret knowledge of certain aspects of the case had made it wholly impossible for her to do anything that day with even simulated interest.

She had been debating with herself whether or not to confide to her mother the story of the tragic tableau of which she had been an accidental witness, when Mrs. Strong had dashed into her bedroom to give her a hurried peck on the cheek and to say that she was off to luncheon and the matinee with Mrs. Starrett.