I have learned all. Do not come to the ranch for me, as you have planned. Evil impends. In fact I feel that he means to do you harm. I plead with you, do not come. It is the only way you can avert certain tragedy. I am sending this by Wong, as I am watched closely, though he pretends to be looking out only for my welfare. I can escape in some way. I am not afraid—only for you. Again I plead with you not to come. You will be going into a deathtrap.

Helen

Wong, the factotum from the Greek Letter Ranch, had brought the letter and had duly stamped it and dropped it in the box for outgoing mail, three days before the murder on the Dollar Sign road. Wong had all the appearance of a man frightened and in a hurry. Talpers sought to detain him, but the Chinese hurried back to his old white horse and climbed clumsily into the saddle.

"It's a long time sence I've seen that old white hoss with the big pitchfork brand on his shoulder," said Talpers. "You ain't ridin' up here for supplies as often as you used to, Wong. Must be gettin' all your stuff by mail-order route. Well, I ain't sore about it, so wait awhile and have a little smoke and talk."

But Wong had shaken his head and departed as rapidly in the direction of the ranch as his limited riding ability would permit.

The letter that Wong had mailed had not gone to its addressed destination. Talpers had opened it and read it, out of idle curiosity, intending to seal the flap again and remail it if it proved to be nothing out of the ordinary. But there were hints of interesting things in the letter, and Bill kept it a day or so for re-reading. Then he kept it for another day because he had stuck it in his pocket and all but forgotten about it. Afterward came the murder, with the name of Sargent figuring, and Bill kept the letter for various reasons, one of which was that he did not know what else to do with it.

"It's too late for that feller to git it now, any ways," was Bill's comfortable philosophy. "And if I'd go and mail it now, some fool inspector might make it cost me my job as postmaster. Besides, it may come useful in my business—who knows?"

The usefulness of the letter, from Bill's standpoint, began to be apparent the day after the murder, when Helen Ervin rode up to the store on the white horse which Wong had graced. The girl rode well. She was hatless and dressed in a neat riding-suit—the conventional attire of her classmates who had gone in for riding-lessons. Her riding-clothes were the first thing she had packed, on leaving San Francisco, as the very word "ranch" had suggested delightful excursions in the saddle.

Two or three Indians sat stolidly on the porch as Helen rode up. She had learned that the old horse was not given to running away. He might roll, to rid himself of the flies, but he was not even likely to do that with the saddle on, so Helen did not trouble to tie him to the rack. She let the reins drop to the ground and walked past the Indians into the store, where Bill Talpers was watching her greedily from behind his postmaster's desk.

"You are postmaster here, Mr. Talpers, aren't you?" asked Helen, with a slight acknowledgment of the trader's greeting.