Title: The Secret Visitors
Description: When the World Security Organization asked Doctor Lockhart to treat their mysterious prisoner, they hadn't known that the dying old man would reply to their questions in a totally unknown language. They had expected the stranger to reveal something about the world war which seemed imminent. But they had been thinking in terms of foreign spies - not alien beings!
Now suddenly they found themselves confronted with a Gargantuan task. They had to find a way to another world, a means of communicating with creatures they could barely imagine.
They had to  stop a war which was originating in the fartherest stars - or else surrender the Earth unconditionally to THE SECRET VISITORS.
Subjects: Science Fiction, Alien Invasion, English Science fiction
People: Dr Lockhart