four o'clock
`` Four o'clock in the afternoon . '' `` Yes , '' said Chayne . The story was borne out by the telegram . Leaving Courmayeur early , Lattery and his guide would have slept the night on the rocks at the foot of the Blaitiere , they would have climbed all the next day and at four o'clock had reached within two hundred feet of the ridge , within two hundred feet of safety . Somewhere within those last two hundred feet the fatal slip had been made ; or perhaps a stone had fallen . `` For how long did you watch them ? '' asked Chayne .