"No," said Lindsay. "I don't know which and furthermore it is unimportant."
"Might be," objected Grant. "How many are there and what is their ability?"
"There are about seventy Martians known to be able to do mental telepathy under ideal circumstances. Of the seventy-odd, all of them are attuned to only one or two of the others. So we have an aggregation of seventy, in groups of three maximum, that are able to do it."
"Is any of Jenna's family—?"
"Not that I know of. And besides, Jenna's loyal."
"They might be reading her mind unwittingly," said Garrard.
"Impossible."
"Know everything?" said Garrard, instantly regretting the implication.
"Only that Jenna's father was a psychoneural surgeon, and I've read plenty of his books on the subject. They're authoritative."
"Were, before the war."