Igor Kirievsky, a programmer at the bank, was killed, and later his friend, also a programmer, Sergei Fomin, disappeared. Lena Brusnikina, together with intern Vadik, comes to the bank manager, who tells how two weeks ago their server was hacked and a fictitious payment in the amount of four hundred thousand dollars was made. After a meeting with the head of the technical department, Shilov, Vadim has doubts about his sincerity…
 

Olga is afraid: in her absence, someone appears in the apartment she recently inherited from her deceased father, turns on the light there and rearranges things from place to place. The police are laughing at the girl — they advise to treat her nerves. She finds understanding only in Artyom and Mukhtar. Upon careful inspection of the housing, Mukhtar discovers a hiding place in the floor, and in it — a scattering of Yakut diamonds…