“You can whistle for it!” said Joe Arnold. “Just keep on whistling!”

Half an hour later the Mapes twins set down their planes on the landing field of the Harbor Grace airport, taking on a supply of oil and gas. As Terry watched the men at work, Prim suddenly ran to her sister thrusting a torn newspaper into her hand.

“Oh Terry, read this. They’ve arrested Dad! They are going to grill him to find out if he knows anything about the kidnapping. Oh Terry, what will we do?”

Terry’s face turned pale as death. Then determination to win once more came to her aid.

“Prim, there’s only one way in which we can help Dad. We must get those boys back to Elmwood. Let’s go. Prim, you take Sally in The Comet and when you get one of the boys aboard make a straight shoot home. Don’t even wait for me, if I lag behind. Get back to Dad!”

The girls lost no time in getting their planes started.

“You’re in luck,” cried Dan through the earphones. “It’s not often that the sea is as smooth as it is today. Sometimes the wind howls around here like all furies—that’s when some of the fishermen’s boats get lost. And you’re in luck again because Mackey Jones’ fleet is headed home.”

Terry kept her plane down toward the water and a moment later Dan again called, “I’m sure that’s Mackey Jones’ fleet below you.” Terry banked and circled over the boats. She was answered by a vigorous waving of arms from the bow of the largest vessel.

“There they are! There’s your friends. How are you going to get them into the plane?” cried Dan.

But at the moment, other figures ran to the boys and the pair disappeared. They had been thrust down the hatchway.