Investigation The Hotel Windows game

story
it was 4:30 AM when top Detective Robert received a call from the district chief that an employee from a hotel feel from the 6th floor of the building cutting his body apart.police investigation cannot really identify who the murderer is but supernatural experts said that some unknown entity is at work in the hotel.Due to lack of eyewitness, investigators can only say that "A compelling unknown force had caused the death".so its your job to go to the hotel alone and solve the mystery behind the incident.But is Robert alone in his investigation?