Contents:
- "Arm of the Law" from Fantastic Universe August 1958
- "Deathworld" from Astounding Science Fiction January, February and March 1960
- "The Ethical Engineer" from Analog Science Fact & Fiction July and August 1963
- "The K-Factor" from Analog December 1960
- "The Misplaced Battleship" from Astounding Science Fiction April 1960
- "Navy Day" from If Worlds of Science Fiction January 1954
- "Planet of the Damned" from Analog Science Fact-Science Fiction, Sept.-Nov. 1961
- "The Repairman" from Galaxy February 1958
- "Sense of Obligation" from Analog Science Fact & Fiction September, October, November 1961
- "Toy Shop" from Analog April 1962
- "The Velvet Glove" from Fantastic Universe November 1956