Murray Leinster’s The Mutant Weapon

The Mutant Weapon is a science fiction novella (or maybe at a stretch a short novel) by Murray Leinster (1896-1975). Leinster was a prolific American science fiction writer who deserves a lot more attention. He wrote mostly short fiction.

The Mutant Weapon was published in Astounding Science Fiction in 1957. It’s part of his extensive Med Service series.

The story takes place in a future in which humans have colonised hundreds of planets. But Leinster understands something that so many other science fiction writers have failed to understand. Any kind of interstellar empire or federation would be impossible. When travel between the colony worlds takes years there can be nothing even approaching a central government. All the colony worlds are in practice entirely autonomous. They recognise no central authority.

The one partial exception is the Med Service. Med Service spaceships are constantly visiting other worlds. A Med Service man has in theory vast authority but has no means of imposing that authority. Because the Med Service is universally recognised as useful in practice any planetary government will almost certainly quite voluntarily recognise a Med Service man’s authority. The Med Service is the only way the colony worlds can have access to the latest medical technologies.

Calhoun is a Med Service man about to conduct a routine health examination on a brand new colony. His ship has a crew of two, the second crew member being Murgatroyd. Murgatroyd is a tormal. Tormals are cute monkey-like animals but they have a couple of very significant biological peculiarities that make them incredibly useful. Calhoun is very fond of Murgatroyd.

No-one has ever interfered with the Med Service. Why would they? It would make no sense. So Calhoun is more than a little puzzled when someone tries to destroy his spaceship.

When Calhoun does land there are more puzzles. A vast city apparently empty. A man lying dead in a field. He has starved to death but he is surrounded by food. This is impossible.

What is happening on this planet is bizarre, inexplicable, sinister and terrifying. With horrifying implications. It’s a plague but it breaks all the rules of known medical science.

I’m not going to say any more about the plot other than that it contains some very cool ideas and twists.

I like Calhoun. He’s not at all a straightforward action. He’s a doctor and he detests the idea of harming people. On the other hand he has an extraordinary steely determination and a very strong sense of justice. He can be a very formidable adversary and when he has to resort to action he does so in extremely devious and imaginative ways.

And while the focus is on Calhoun’s search for answers there is some action and suspense and a very real sense of menace. And evil. And it’s a nasty kind of calculated evil.

Calhoun is a man who thinks in terms of probabilities. Actions have consequences which can to some extent be predicted. And ingenious plans fail because the people who devise ingenious master plans never take chance consequences into account.

The Mutant Weapon is clever superior-grade science fiction and it’s highly recommended.

Murray Leinster should be regarded as one of the science fiction greats. I’ve reviewed his 1953 alien invasion tale The Invaders and absolutely superb short story collection The Best of Murray Leinster.

Armchair Fiction have paired The Mutant Weapon with J.J. Allerton’s Moon of Battle in a two-novel paperback edition.