Over those whom fate has determined to drown, the merman receives a mysterious power that cannot be avoided.

By the will of fate, Sergei Kovalev, a master of sports in swimming, finds himself in a village on a large river, where he visited in early childhood and where his grandparents never brought him. It was here that his mother, whom he does not remember, drowned. Now he is haunted by a strange obsession: he painfully wants to swim across the river, and it’s November outside...