Snake Spring is a 1997 Russian mystery thriller film, and the directorial debut of Nikolai Lebedev. It is one of the first psychological thrillers of Russian cinema after the Soviet Union.

Plot

The film is set in the end of the 1990s. Dina Sergeeva (Yekaterina Guseva), a young student of a pedagogical university's biological faculty, comes for an internship to a correctional school in a provincial town for the sake of her beau Alexei (Sergei Makhovikov), doctor of the local school's laboratory. During their nocturnal meeting in the city park near the beach, it turns out that the young man has already married Zinochka (Ekaterina Vulichenko) – the underage daughter of schoolteacher Mariana Pavlovna. Additionally, she is pregnant with Alexei's child. This news upsets the woman very much, and out of grief she decides to submerge herself in the city's reservoir.