The Repairmen of Cyclops / Enigma From Tantalus by John Brunner ⭐⭐⭐

An Ace Double I bought for the cool covers. The Repairman of Cyclops is essentially a debate on the ethics of the Prime Directive from before Star Trek existed. IMO it comes to the wrong conclusion. Enigma From Tantalus is a first contact creature feature / locked room mystery on a spaceship which is OK if you go along with its narrow logic. These have a certain dated charm but aren’t among the best stories I’ve read from this era.