twelve o'clock
This had been taken into consideration long before . Heavy clouds hung over the river , throwing the prison and its environs into still more security for Jack 's purpose . He reconnoitred every available point , searched every corner of possible danger , and as the time passed he began to rage with impatience against Dick , whose delay was now periling the success of the enterprise . It was twelve o'clock and after . He dared wait no longer . Dick must shift for himself . Perhaps he had lost his way .