"Well, then," Nestor went on, "we don't know much about the matter, except that there are hostile influences at work down there, directed against the canal. We do not know the proposed point of attack, but presume that the big dam is in the greatest danger. We do not even know where to look for the plotters, or whether they are Americans or of foreign birth. The motive for the contemplated destruction of the great waterway is not even surmised. In fact, for all we know, this may be a scare, but the thing is serious enough to call for rigid investigation, so down there we go."