Before the echo had died away, sixteen grinning faces appeared from under the bridge.

There was a moment of speechless amazement, and then Polly asked in a quiet voice that contrasted ridiculously with Betty’s mighty yell:

“Were you calling us?”

“Look, they’re here.”

“Under the bridge.”

“Where’s the trail?”

“Here, look!”

“We’re blind!” came the chorus from the startled hounds, followed by:

“How did you do it?”

“Have you been here all the time?”