When Pete Mason's father is badly hurt in a space mining accident, eighteen-year-old Pete suspects that the injury was no accident – that it was caused by his family's rivals, Rachel Barry and her children. Even so, when Pete receives an urgent call for help from Jane, Rachel's oldest daughter, he risks his life to save her, only to find that Jane's uncle has taken advantage of the opportunity to jump Pete's new mining claim. Pete is furious; he refuses to listen to...
Go backward through space-time into prehistory? It seemed fantastic, but the machine – invented by Bob's father in connection with his research on the interrelation of time and gravity – actually existed. Bob and his friend Pete are anxious to be the first to visit the era of the dinosaurs. Overruled, they watch Pete's father, a famous paleontologist, step into the shimmering ring – and disappear into the past. But when he does not return on schedule because the machine jams, Bob and...
