The eyes he raises to his granddaughter are like hers, and there is a further resemblance in the dark skin.

His face brightens and his eyes kindle as he clasps Sylvia's slender, supple hand.
"It must be a student--are you sure he isn't a student ?" Sylvia was confident of it.
"Very likely an agent, then.

They're very clever about disguising themselves.

I never see agents, you know, Sylvia." Sylvia declared her belief that the stranger was not an agent, and the professor glanced at his book reluctantly.
"Very well; I will see him.

I wish you would run down these references for me, Sylvia.