After waiting for a long time, a young couple finally moves into a new apartment. However, unusual happen from the very beginning: first: they keep seeing some strange people without being able to determine what they want, and then, someone keeps trying to open their door at night, and to break into the apartment. However, even though someone breaks into the apartment several times, nothing is stolen, and for this reason, the young couple is afraid. This fear grows because, whenever they lack money, some unknown person sends them money in a letter by mail. Although the sum sent is not small, and they could use this money to settle their financial problems, they are reluctant to spend it as they don`t know its origin. They believe the money is in some way connected with the mysterious cases when someone broke into their apartment, and they think that they are expected to do something for that money, but they don`t know what. The young couple experiences unusual and even dangerous thinks, until their situation is suddenly resolved in an unexpected manner.