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.
Олег Жаков
as Lyudov
Roza Balashova
as Rakitina
Oleg Tumanov
as michman Ageyev
Lev Frichinskiy
as sailor Zhukov
Екатерина Савинова
as Shubina
Владимир Балашов
as Kobchikov
Виктор Кулаков
as resident 'Semyon'
Александр Стародуб
as Savelyev
Lidiya Matsiyevskaya
as Rakitina's grandmother
Pavel Mikhailov
as 1st rank captain
Levon Chinidzhants
as Kozlov-Kupriyanov
Андрій Сова
as Vasiliy
