Kdo je ubil Anastazijo Elster?

One night Aleksander visits a hotel. There is nobody at the reception, therefore he takes a key and heads upstairs to a hotel room. There he sees a girl lying on the bed. He approaches and finds out she is dead. At the same time, the telephone rings and wakes him up. He picks up the phone and despite objections from his wife Julija, leaves their apartment in the middle of the night. Suddenly, he finds himself once again in front of the same hotel.