They were in the wood, somewhere.

Were they bound for Singleton?
Presently he was able to distinguish voices, and a minute afterwards it seemed as if every sound had ceased.
He stepped quietly, followed by Jupiter, from the east terrace to the rampart over the great gate, where he was able to command as full a view as the uncertain light would allow of the glade through the frees which led to the castle.

But nothing could be seen.

As he watched, the sounds commenced again, and this time he fancied he could detect a rumbling noise as of a cart accompanying the horsemen.
It was now easy to tell the meaning of all these sounds.

A troop of horsemen--he could not yet guess how many--were approaching Singleton Towers; and bringing with them a gun! The young laird's heart beat now in right earnest, but not with fear.
That had been left behind with the ghosts.