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“Both the boys noticed that Mr. Smith was twisting a crested gold ring on his finger. "Looks like a school emblem," Frank thought, then suddenly realized what the man was telling him. "He's from SKOOL!" Joe got the message at the same time and threw a quick glance at his brother. Dell smiled. "I felt sure you would understand. It is safer if some things are not said aloud. Mr. Smith and I work together." So Dell was also a member of SKOOL, working under the guise of security officer for Great Circle Airways!” — Franklin W. Dixon
Both the boys noticed that Mr. Smith was twisting a crested gold ring on his finger. "Looks like a school emblem," Frank thought, then suddenly realized what the man was telling him. "He's from SKOOL!" Joe got the message at the same time and threw a quick glance at his brother. Dell smiled. "I felt sure you would understand. It is safer if some things are not said aloud. Mr. Smith and I work together." So Dell was also a member of SKOOL, working under the guise of security officer for Great Circle Airways!