Star Ka'at: Andre Norton

They weren't ordinary cats. There was something strange about the way they looked at Jim and Elly, as if they could see inside their minds and knew exactly what they were thinking. And they could talk by telepathy instead of speech. They were the Star Ka'ats, a super-intelligent race of cats from outer space. They had come to Earth on a special mission. But when Jim and Elly crossed their path, the Star Ka'ats suddenly found their plans might have to change... For younger readers.