whispered to herself. “And I will live—and die, if necessary—as an English girl should.”

With those words upon her lips she crept away from the laboratory, down the stairs to her room, and, swiftly putting on her fur coat, she went into the basement, from which she let herself out noiselessly, and then hurried through the night, in the direction of Hammersmith Bridge.

On gaining the bridge, she saw the red rear-light of a motor-car, and knew that it was Kennedy’s. He had drawn up against the kerb, and had been consuming cigarettes waiting in impatience for a long time.

“Well, darling?” he asked, as they met. “I got your message from the theatre to-night. What is in progress?”

“Something desperate,” was her quick reply. “Let’s get into the car and I’ll explain.”

Both entered the comfortable little coupé, and then Ella explained in detail to her flying-man lover all that she had discovered.

The keen-faced, clean-shaven young officer in uniform who, before he had gone in for aviation duties, had graduated at Osborne, and afterwards been at sea and risen from “snotty” to lieutenant, sat beside her, listening intently.

“Just as we thought, darling,” he remarked. “For me, loving you so dearly, it is a terrible thing to know that your father is such a deadly and ingenious enemy of ours as he is. Truly the German plotters are in our midst in every walk of life, from high society down to the scum of the East End. The brutes are out to win the war by any underhand, subtle, and brutal means in their power. But we have discovered one line of their enemy intentions and, with your aid, dearest, we will follow it up and, without exposing your father and bringing disgrace upon you, we’ll set out to combat them every time.”

“Agreed, dear,” declared the girl with patriotic enthusiasm. “I have told you all along of my suspicions. To-night they are verified. Father, and that devilish scoundrel, Nystrom, mean mischief—for payment too—one thousand pounds each!”

“The infernal brutes!” exclaimed the man at her side. “At least it is to you, dear, that this discovery is due. I had no idea what you were after when you sent me that wire to-night.”

“I suspected, and my suspicions have proved correct,” said the girl. “Shall we wait here and follow them? They must cross the river if they intend to go into London to-night—as no doubt they do.”

“Yes. They believe you to be soundly asleep, I suppose?”

“I locked my door, and have the key in my pocket,” replied his well-beloved with a light laugh.

And she, putting her ready lips to his, sat with him in the car at the foot of the long suspension-bridge, waiting for any person to cross.

They remained there for perhaps half-an-hour, ever eager and watchful. Several taxis passed, but otherwise all was quiet in the night. Now and then across the sky fell the big beams of searchlights seeking enemy aircraft, and these they were watching, when, suddenly, a powerful, dark-painted car approached.

“Look!” cried Ella. “Why, that’s that fellow Benyon’s car—he’s a friend of Dad’s!”

Next moment it flashed past, and beneath the dim light at the head of the bridge they both caught a glimpse of two men within, one of whom was undoubtedly Theodore Drost.

“Quick!” cried Ella. “Let’s follow them! Fortunately you have to-night another car, unknown to them!”

In an instant Seymour Kennedy had started his engine, and slowly he drew out across the bridge, speeding after the retreating car over the river, along Bridge Road to Hammersmith Broadway and through Brook Green, in a direction due north.

Through the London streets it was not difficult at that hour to follow the red tail-light of the car in which Drost sat with his bosom friend George Benyon, a mysterious person who seemed to be an adventurer, and who lived somewhere in York or its vicinity.

“I wonder if they are going up to York?” Ella asked, as she sat in the deep seat of the coupé at her lover’s side.

“We’ll see. If they get on to the North Road we shall at once know their intentions,” was her lover’s reply.

Half-an-hour later the pseudo-Dutch pastor and his companion, driven by rather a reckless young fellow, were on the main Great North Road, and Kennedy, possessing a lighter and superior car, had no misgivings as to overtaking them whenever he wished.

On through the night they went, passing Barnet, Hatfield, Hitchin, the cross-roads at Wansford, and up the crooked pebbled streets of Stamford, until in the grey of morning they descended into Grantham, with its tall spire and quaint old Angel and Crown Hotel.

It was there that Drost and his companion breakfasted, while Ella and her lover waited and watched.

Some devilish plot of a high-explosive nature was in progress, but of its true import they were in utter ignorance. Yet their two British hearts beat quickly in unison, and both were determined to frustrate the outrage, even at the sacrifice of their own lives.

At three o’clock in the afternoon Drost and Benyon drew up at the Station Hotel at York, and there took lunch, while Ella and her lover ate a very hurried and much-needed meal in the railway-buffet in the big station adjoining.

Then, after they had watched the departure of the big mud-spattered car which contained the two conspirators, they were very quickly upon the road again after them.

Out of the quiet old streets of York city, past the Minster, they turned eastward upon that well-kept highway which led towards the North Sea Coast.

An hour’s run brought them to the pleasant town which I must not, with the alarming provisions of the Defence of the Realm Act before me, indicate with any other initial save that of J—.

The town of J—, built upon a deep and pretty bay forming a natural harbour with its breakwater and pier, was, in the pre-war days, a popular resort of the summer girl with her transparent blouses and her pretty bathing costumes, but since hostilities, it was a place believed to be within the danger zone.

As they descended, by the long, winding road, into the town, they could see, in the bay, a big grey four-funnelled first-class cruiser lying at anchor, the grey smoke curling lazily from her striped funnels—resting there no doubt after many weeks of patrol duty in the vicinity of the Kiel Canal.

Indeed, as they went along the High Street, they saw a number of clear-eyed liberty men—bluejackets—bearing upon their caps the name H.M.S. Oakham.

The car containing Ella’s father and his companion pulled up at the Palace Hotel, a big imposing place, high on the cliff, therefore Kennedy, much satisfied that he had thus been able to follow the car for over two hundred miles, went on some little distance to the next available hotel.

This latter place, like the Palace, afforded a fine view of the bay, and as they stood at a window of the palm-lined lounge, they could see that upon the cruiser lights were already appearing.

Kennedy called the waiter for a drink, and carelessly asked what was in progress.

“The ship—the Oakham—came in the day before yesterday, sir,” the man replied. “There’s a party on board this evening, they say—our Mayor and corporation, and all the