In the darkness on a road with trees on either side--the road which runs from Tonbridge to Shipborne, and passes between Deene Park and Frith Wood--stood Kennedy and Ella. They had ridden down from London earlier in the evening and placed their motorcycles inside a gate which led into the forest on the left side of the road. They waited in silence, their ears strained, but neither uttered a word. Kennedy had showed his well-beloved the time. It was half-past one in the morning. Of a sudden, a motor-car came up the hill, a closed car, which passed them swiftly, and then, about a quarter-of-a-mile further on, came to a halt. Presently they heard footsteps in the darkness and in their direction there walked three men. The moon was shining fitfully through the clouds, therefore they were just able to distinguish them. The trio were whispering, and two of them were carrying good-sized kit-bags. They came to the gate where, inside, Ella and Kennedy had hidden their cycles, and there halted. That they were smoking Kennedy and his companion knew by the slight odour of tobacco that reached them. For a full quarter-of-an-hour they remained there, chatting in low whispers. "I wonder who they are?" asked Ella, bending to her lover's ear. "Who knows?" replied the air-pilot. "At any rate, we'll have a good view from here. You were not mistaken as to the spot?" "No. I heard it discussed last night," was the girl's reply. Then, a moment later, there was a low sound of wheels and horses' hoofs climbing the hill from the open common into that stretch of road darkened by the overhanging trees. Ella peered forth and saw a dim oil lamp approaching, while the jingling of the harness sounded plain as the horses strained at their traces. Onward they came, until when close to the gate where the three men lay in waiting, one of the latter flashed a bright light into the face of the old man who was driving the waggon, and shouted: "Stop! _Stop_!" The driver pulled up in surprise, dazzled by the light, but the next second another man had flung into his face a mixture of cayenne pepper and chemicals by which, in an instant, he had become blinded and stupefied, falling back into his seat inert and helpless. Then Ella and Kennedy, creeping up unnoticed by the three in their excitement, saw that they had mounted into the waggon, which was loaded with milk-churns--the waggon driven nightly from Furze Down Farm to the great camp at B--, carrying the milk for the morning. Upon these chums the three set swiftly to work, opening each, dropping in one of those soluble bombs, and closing them. The bombs they took from the two kit-bags they had carried from the car. They were engaged in carrying out one of the most dastardly plots ever conceived by Drost and his friends--infecting the milk supply of the great training-camp!