The history of the great migration of Earthlings to new planets. Overcoming interstellar space stretches over many generations. People are born and die in space. They learned to survive and grow entire gardens. But, as in any society, there must also be police on the starship. Inspector Eldar Lem is investigating rare and minor incidents when he suddenly discovers a connection between some of them. But the Osazha holiday is approaching, and events unfold in the most unexpected way for all the inhabitants of the ship under the proud name "Mosey".