chunk: Murdoch is eventually caught by inspector Bumstead, who acknowledges he is innocent, and by then has his own misgivings about the nature of the city. They confront Dr. Schreber, who explains that the Strangers are endangered extraterrestrial parasites who use corpses as their hosts. Having a hive mind, the Strangers have been experimenting with humans to analyze their individuality in the hopes that some insight might be revealed that would help their race survive.