In a quiet Moscow courtyard lives a small bulldog, the guide of a blind man. One day, while walking with a blind man at night, he raises a sudden furious bark as he looks into the darkness. He sees something scary. His owner cannot figure out what he is seeing. During the next night's walk, this story repeats itself, and it happens every night, in different places in the yard. Two cunning girls living next door decide to reveal the secret. And they succeed. But the result leads them to madness...