Hellhounds of the Cosmos

In this early novella by Clifford Simak, the planet faces a dire threat from an elusive entity called the Black Horror, which seems resistant to mankind's weaponry. As the future of Earth hangs in the balance, Dr. Silas White must seek unconventional solutions, exploring themes of alien invasion, time travel, and the multiverse. This work encapsulates elements that have become foundational in the science fiction genre.