Dima and Leshka could not even dream of such a vacation! Not only will the brothers have to travel along the Volga all the way to Astrakhan, but also on a real old steamship with a smoking chimney! Here you could enjoy the trip to the fullest, but... a chilling howl comes from the locked hold. And under the cover of darkness, suspicious boxes are brought ashore, from which one can clearly hear: “I want to go to my mother!” “You can’t just leave it like that!” - the brothers decide. They penetrate the mysterious hold and can’t believe their eyes! It was inexorably approaching them...