The Mavka, a mystical and dangerous forest nymph, falls in love with the biologist Lukyan instead of destroying him in the mysterious forest lake, where mermaids and other nymphs await men's souls. And they are ready to do anything to keep the Mavka on the dark side.

The film takes place during the full-scale Russian invasion of Ukraine. After the Kakhovka dam is blown up, a detachment of Ukrainian soldiers led by a female fighter with the call sign Mara finds themselves in a secret Soviet bunker at the bottom of a reservoir where the USSR conducted human experiments during the Cold War. The consequences of these experiments are still in the bunker in the form of the half-living corpses of Soviet soldiers. Now, in order to survive, Ukrainians need to defeat the Soviet zombies, their own fear, as well as overcome internal disputes and trust each other.

December 31st Express was supposed to be an ordinary, quiet rail run, at least that's what conductor Mykola Ivanovych thought. However, a comically chaotic group of passengers including a runaway bride and angry accountant upset a retiring train conductor's peaceful last journey.