"'Tis a letter."

"A letter! Where is it?"

Billy related the circumstances of the discovery of the letter. Then he said:

"'Tis a sealed letter. I wants t' show it t' Doctor Luke."

"He's not back."

"Not back? That's queer!"

"Oh, no," said Archie, easily; "the case has turned out to be more serious than he thought and has detained him. Where's the letter?"

Billy gave the letter to Archie.

"Bread-and-Butter," Archie read. "No other address. That is queer. What shall we do about it?"