wore a tight-fitting, dark-blue suit and a white, high-collared shirt. His clothes were as formal as Biff’s were informal.

They mounted the loading ramp and entered the plane. The stewardess gave them the same interested, friendly look the gate attendant had given them.

“I’m sure you two will want to sit together,” she said. “You’re twins, aren’t you?”

“No, ma’am,” Biff gulped.

The stewardess seated the boys, disbelief showing in her eyes as they shifted from the face of one boy to the other. She started moving toward the door, but kept turning her head to cast a look at the boys.

Biff was seated next to the window. His seat companion arose, removed his hat, and placed it on the rack above. His hair was cropped short, as Biff’s was. It was a shade darker, perhaps, but just a shade. Biff’s habit of going hatless could have made the difference.

On close examination of the boys’ faces, there was one noticeable difference. Biff’s eyes were bluish-gray. The other boy’s were a deep blue.

Biff turned in his seat to confront his companion.

“Since we look so much alike,” Biff said, “maybe we’d better find out who we are. I’m Biff Brewster. So you can’t be. I mean, if I am Biff Brewster—and I know I was until I saw you just now—then you must be someone else.”

Biff was having a hard time trying to say what he meant. He wasn’t exactly sure just what he meant.

The other boy smiled.

“I am glad to make your acquaintance, Biff Brewster,” he said quite formally. “My name is Derek Zook. I am from The Netherlands.”

Derek’s English was good with hardly any trace of accent. His phrasing, somewhat stiff and formal, marked it as Continental, not American, English. It was obvious that he had acquired his knowledge of the language at school. His sentences didn’t have the free and easy swing of a native language.

“Where are you going?” Biff asked.

“I go to Willemstad in Curaçao. That’s in the Netherlands Antilles.”

“Yes, I know,” Biff replied. His astonishment continued to grow as the coincidences grew. “I’m going there too. Here we are. We look alike, and we’re going to the same place. Now how 

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