Two teenagers Marco and Lyuda are helping border guards to catch a spy.
Lyuda
Marco
Очерет
Red-bearded
Levko
Gritsko
Katya
Kovalchuk
unknown
"Akula"
mother of Mark and Gritska
diversant - kapitan mini-podlodki
predstavitel' gosbezopasnosti
Alexey Vladimirovich - captain 1st rank
kapitan 3-go ranga
totya Lyudy
kontr-admiral
