The three started across the street, and as they did so Plum and Jasniff moved away in the direction of one of the dwelling houses. Before they could be stopped they had mounted the porch, opened the door, and gone inside. Those outside heard the door locked, and then all became quiet.
"Well, I never!" came from Dave. "This is certainly a mystery."
There was good cause for his words. The front of the dwelling was entirely dark and the lower windows had the solid wooden shutters tightly closed.
"Shall I ring the bell?" asked Roger, after a pause in perplexity.
"There is no bell to ring," answered Shadow.
"I wouldn't knock," advised Dave. "What's the use? We may only get into a row."
"The doctor ought to know that Jasniff is here," said Roger.
"We can tell him that, even if Plum won't," added Shadow. "I agree with Dave, it will do no good to knock."
"I'd like to know if they saw us," said Dave, as he and his chums continued on their way up the street.