C1916 The Murderer Was a Woman

Only one of them had been found wearing a mask, which, presumably, the killer had removed before he left, in order to escape their pursuit.

After all, in the eyes of the police, the murderers would not be willing to reveal their innocence to anyone else, but they did not expect the murderer to be so bold as to take off his mask. Was he not afraid of being discovered? Was he too arrogant