A collection of mid-century science fiction stories by Poul Anderson, one of the key architects of hard SF in the 1960s.

These stories explore time travel, cosmic scale conflict, and the limits of known physics, written in the era when speculative fiction was still in close conversation with scientific optimism and Cold War anxiety.

For readers of Asimov, Clarke, Heinlein and those interested in the intellectual backbone of 20th-century science fiction.