That was one point, but he speedily devised a way of overcoming that.
There was another danger to be considered, and it took him longer to calculate this.

Naturally there was a patrol about the house.

Fred himself had had to avoid the sentry, making his steady round.

Now he lay in the bushes and timed the man's appearances for nearly half an hour.
There were two men, as a matter of fact, and they met on each circling of the house.

Fortunately, their meeting came at the very end of the garden.