The Eye of the Queen

When the Pe-Ellians came, it was the legendary founder of the Contact Linguistics Institute, Marius Thorndyke, they asked for. And Thorndyke, the foremost contact linguist on Earth, willingly returned to Pe-Ellia at their request. He was a veteran of contacts with other alient species but they had always been technologically inferior to Earth. The Pe-Ellians were different: they clearly came from a very advanced civilization - a civilization that understood the power of thought.