They came in, looking a little scared and still holding one another by the hand. They wished the Professor good evening, and when he rose they backed away from him. The Professor shook hands with them, but they did not let go, so that Victoria gave him her right hand and Victor his left, and then at the Professor's invitation they sat themselves down on the extreme edge of the sofa.
"I hope we do not disturb you," said Victor. "We wanted to see Mademoiselle Malvina."
"Why do you want to see Mademoiselle Malvina?" inquired the Professor.
"It is something very private," said Victor.
"We wanted to ask her a great favour," said Victoria.
"I'm sorry," said the Professor, "but she isn't in. At least, I don't think so." (The Professor never was quite sure. "She slips in and out making no more noise than a wind-driven rose leaf," was Mrs. Muldoon's explanation.) "Hadn't you better tell me? Leave me to put it to her."
They looked at one another. It would never do to offend the wise and learned Christopher. Besides, a magician, it is to be assumed, has more ways than one of learning what people are thinking.
"It is about mamma," explained Victoria. "We wondered if Malvina would mind changing her."
The Professor had been reading up Malvina. It flashed across him that this had always been her speciality: Changing people. How had the Arlington twins discovered it? And why did they want their mother changed? And what did they want her changed into? It was shocking when you come to think of it! The Professor became suddenly so stern, that if the twins could have seen his expression—which, owing to the fading light, they couldn't—they would have been too frightened to answer.
"Why do you want your mother changed?" demanded the Professor. Even as it was his voice alarmed them.