The Mutant Weapon Murray Leinster

The only links between the far-flung space colonies were the Medical Services spaceships. When these lonely travelers paid a call, they were always given a royal welcome. So why did the landing grid on Marix III try to destroy Med Serviceman Calhoun"s ship? Это и многое другое вы найдете в книге The Mutant Weapon (Murray Leinster)