about midnight
Such among the guests who were not detained as witnesses , found themselves at liberty to depart . But very few availed themselves of the privilege . They preferred to stop and see the end of the inquest . Skillful and experienced detectives were summoned by telegraph from Scotland Yard , London , and arrived at the castle about midnight . The house was placed in charge of the police while the investigation was pending . But the materials for the formation of a decided verdict seemed very meagre . A careful examination of the body showed that the banker had been killed by one mortal blow inflicted by a blunt and heavy instrument that had crushed in the skull .