The Cold Front.

Sasha and Ilya, a bored young couple on a verge of breakup, are spending a New Year's Eve at a secluded beach house in Northern France then a carcass of an unidentified creature is washed ashore nearby. Later that day on his way back from a local bar Ilya meets Masha, a lost Russian girl, who seems to have gotten off the train at the wrong station and has nowhere to spend the night.