They were called harders. They were no longer quite human. Because a tiny chip with a special device called an escape was installed in their brain. Iscape allowed, in the event of the death of a harder, to turn back time and replay the dangerous situation again and again until its successful outcome. That is why they were used to solve the most complex and almost impossible tasks. But one day, during the investigation of a catastrophe in space, it turned out that some of the passengers on the starship used devices invented by someone - registers, which allowed any person to move back in time. As a harder. And everything is completely confused in this world...