Sentinels from Space

Guardian Angel When the mutants of the Mars and Venus colonies sought independence, the World Council tried to protect Earth's interests. But even bigger things were at stake: Full-scale war would attract the attentions of the deadly Denebian aliens, who were slowly advancing towards Earth. Only David Raven - and a few others like him - knew about the Denebians. But Raven had powers no human or mutant had ever dreamed of, and he was looking out for humanity... * Magazine version: Startling Stories, November 1951 as "The Star Watchers" First book publication in 1953 by Bouregy & Curl as Sentinels from Space Cover art by Barclay Shaw Introduction by Jack L. Chalker