“Why, it’s just a piece farther on,” the old man replied. “The tower’s right hard to see in this storm.”

While they thawed out, the girls explained that they had been forced to abandon their car at the Riverview Yacht Club. The old man, whose name was Henry Hammill, listened with deep sympathy to their tale of woe.

“I’ll hitch up my horses and take you to Riverview in the sled,” he offered. “That is, unless you’d rather stop at the listening tower.”

“It would save you a long trip,” Penny returned politely. “If Salt Sommers is on duty, I’m sure he’ll take us to our homes.”

In the end it was decided that Old Henry should drive the girls as far as the post. Then, if arrangements could not be made with the photographer, he would keep on to Riverview.

Warm at last, Penny and Louise declared that they were ready to start. Old Henry brought the sled to the door and the team soon was racing down the icy road. Above the jingle of bells arose occasional squeals of laughter, for the young passengers enjoyed every minute of the unexpected ride.

Presently Old Henry pulled up at the side of the road.

“There’s the tower,” he said, pointing to a two-story wooden observatory rising above the evergreens. “I’ll wait until you find out if your friend’s here.”

The girls thanked the old man for his kindly help and scrambled from the sled. They were sure their troubles were over, for they could see Salt Sommers seated at a table in the lighted tower.

A flight of steps led to a narrow catwalk which ran around three sides of the glass-enclosed house. Before Penny and Louise could hammer on the door Salt opened it.