Четвірка з нічним сторожем

During the night, Irina, Tatiana and Katrina set up an outing to try and find out the questions to the following day's exams.

The exam papers are well kept in the head's office.

They have nevertheless a cunning little plan all prepared.

The problem was Vladimir, the night watcher.

They had to get their hands on the key that he always kept in the pocket of his trousers.