two
o'clock
When he was surprised by the arrival of the patrol , he fled into his garden . Which was the best place to hide the diamonds ? Chance caused his eyes to light upon the sun-dial . It was two o'clock . The shadow of the arrow was then falling along the crack in the marble . He obeyed this sign of the shadow , rammed his eighteen diamonds into the dust and calmly went back and surrendered to the soldiers . '' `` But the shadow of the arrow coincides with the crack in the marble every day of the year and not only on the 15th of April . ''