A kind, cheerful man suddenly turns into a sullen, angry grumbler. All around begins to annoy him, and he mercilessly destroys his family, job, entire life. It was caused by an evil magic mirror, and only human tears can heal it.

One evening after a hard day at the office, Pavel Ivanovich Vasin starts to behave quite strangely to family and friends. He leaves home and for the next 24 hours continues to do strange things, until his granddaughter persuades him to have a good cry, after which he feels much better.