At that impressive moment, knowing that on the morrow they would be speeding far from America, the four felt their responsibility keenly.

Hadn’t they been singled out for an important mission? They must try hard to make Mr. Livingston and the other Scouts proud of them! Come what would, they dared not fail or falter.

Chapter 4
A MISSION

“Six days overdue, and no sign of the Shark! What a help Captain Carter proved to be!”

Jack delivered the remark as he lay on the steep hillside overlooking Cuertos harbor in Peru. His sentiment was shared by the other Explorers, Willie, Ken and War. Six days of waiting in a desolate coastal town had left the four Rovers decidedly restless and impatient.

Behind them now were a thrilling plane journey from the States, exciting days in Lima. But nearly a week had elapsed since they had registered at the little Cuertos Hotel in this sleepy town seldom visited by tourists.

To the annoyance of Mr. Livingston and the Scouts, the Shark had not yet made port. What, they wondered, had delayed Captain Carter and their supplies?

On this sunny morning, while Mr. Livingston conferred with government officials, Jack and his friends had decided to watch the harbor for a possible glimpse of the long overdue vessel.

“Maybe Carter never will show up,” War remarked, tossing a stone into the waves which broke gently on the shore below. “I don’t trust him.”

“The Shark may have run into bad storms,” Jack replied. “It’s hard waiting, though—especially when we can’t pick up any information about Burton Monahan.”