The team of the space ore carrier "Mark-10," completes its first expedition far beyond the solar system. Behind him are years of hard work and tons of dangerous cargo in a hitch, and ahead is a two-light-year journey home. The crew is urgently awakened by a signal from the Earth. Astronauts learn that an unmanned Osiris-3 starship with Artificial Intelligence on board is in distress somewhere nearby. The crew of "Mark-10" is offered a "hack" - you need to make a small hook and diagnose the failed ship. No spacewalks, docking or other tricks - only diagnostics and visual inspection. And all this for an impressive award. In addition, for the work performed, the crew will receive a gift and their invaluable cargo. "Spit" turns into serious problems, solving which, the team learns the terrible secret of "Osiris-3. "Nine people, five rescue capsules and one terrible truth.