An experienced intelligence officer arrives in the USSR as a tourist. The staff of the State Security Committee manages to find out the real reason for Miss Luster's visit, to reveal all her numerous connections with agents of foreign intelligence, to expose and eliminate the criminals.

In one of the southern ports, state security authorities detained a spy with a plan for the object of sabotage — a floating dock, prepared for towing to a remote port. Major Lyudov, according to a number of signs, realizes that a whole group of enemies is operating in the city. With the help of Rakitina, the librarian of the floating dock, Lyudov and his assistant state security lieutenant Savelyev, they manage to unravel the tangle of espionage ties and prevent the crime.

The film tells about a band of demobilized Red Army men and two civilians who cross a Middle Asian desert. They are forced to do battle with superior forces of Basmachi rebels for the dry draw-well.

A hapless loser (with the surname of Loser) undergoes misadventures with avaracious clergy, a tired horse, and a walking granary (among other things) on his road to collectivized happiness.