The Brain Thing — Pat Anderson

The Skyscraper Rocket Ship is on its way back to Earth again, after the detour to Dendria. The new resident, the Dendrian, Emmad, is looking forward to visiting Earth and wants to find out everything she can about the planet. Laura, however, keeps interrupting her, wanting to visit the Leisure Complex. Laura thinks she needs to entertain Emmad, while Emmad does not want to insult Laura by asking for time alone. Johnny and Laura, meanwhile, are not as friendly as they used to be. The residents on the skyscraper all start to fall out with each other, making things very tense. The computer then tells Johnny and Laura more bad news. There is a thing out there in space and it is going to trap the skyscraper. What does it want with them?