"Then let's both go there to-morrow night, and if he comes out of the house we'll watch where he goes."
With this suggestion Gerald agreed, and after she had smoked the cigarette he handed to her from his case, they resumed their punting up-stream in the afternoon sunshine.
Next night they met by appointment at Hammersmith Broadway station at half-past eight, and after a consultation, it was arranged that Marigold should call on her aunt on some pretext, and having ascertained if Boyne had returned, she would rejoin Gerald at a spot in King Street.
Hence he lounged about the busy thoroughfare for a quarter of an hour until she returned with the news that Boyne had been home since six o'clock, he having returned unusually early.
"Ah! That's a good sign," said Gerald. "He'll certainly go out again to-night!"
As they strolled together they arranged that Marigold should loiter near the King Street end of the street, while Gerald should stand in an entry near the house which he had used in his previous observations.
"If you see me pass into King Street, don't follow me too closely," he urged, "and at all hazards don't let him see you. Remember that people who are engaged in crooked business keep their eyes skinned and are always full of suspicion."
"I'll take good care he doesn't see me," the girl answered him. "Trust me to be discreet."
Then they parted, and for about an hour Marigold waited in vain for a sight of her lover. It had now grown quite dark, and the street lamps in Bridge Place were none too brilliant. She was still loitering in the darkness, full of expectation at every footstep on the pavement.
At last she again heard footsteps, and a few moments later recognised Boyne's well-built figure passing within the zone of lamplight across the way. He was walking hurriedly in the direction of King Street, all unconscious that he was being followed. But a few moments later, with noiseless tread – for he wore rubber heels to his shoes – Durrant came along, his eyes searching eagerly for the girl he loved.
Suddenly he saw her in the shadow, and realised that she was discreetly following him.
The pair exchanged a few words in the crowded King Street, and while Gerald hurried on after Boyne towards the station, the girl followed a little distance behind.
They saw him buying a ticket at the station and also purchase a late edition of the evening paper. Then he descended to the platform of the tube and took a train going towards Piccadilly.
Gerald and Marigold, who had separated, travelled on the same train until, on arrival at Knightsbridge, the man they were watching alighted. Marigold, who had been on the alert at each station, saw him emerge from the next car, while close behind him was Gerald, with whom, of course, he was unacquainted.
Together they followed him along Sloane Street to Pont Street, where he ascended the steps of a smart-looking red-brick house and opened the door with a latchkey.
"Now that's curious!" remarked Gerald when he rejoined the girl. "Did you notice that he entered that house yonder as though it were his own home? I wonder who lives there?"
"We must find out," declared Marigold, highly excited at having tracked Mr. Boyne so far.
"Yes. But I shall be compelled to watch the house and see what happens now," he said. "I mean to follow him to-night wherever he goes. It almost seems as if he lives here – as well as in Hammersmith!"
"Well – he certainly has a latchkey, and this is not a street where they take in lodgers."
"No," he said. "Some of these houses are the legations of the smaller States of Europe. Over there is the Serbian Legation."
"Well, we'll wait in patience," she said. "Fortunately it's a fine night."
"The last time I watched, last week, it came on terribly wet about eleven o'clock," he said, "and I hadn't my mackintosh. When I started out it seemed a perfect night. But just now the weather is so changeable."
On the darker side of the street by the railings, the young people idled together, with a watchful eye upon the long flight of steps which Boyne had ascended. Though the blinds were drawn, it was evident that the comfortable West End house was well lighted, and it was, no doubt, the residence of someone of considerable means. Indeed, it requires a good income to run a house even in Pont Street in these post-bellum days.
The traffic had died down. Few taxis were passing, for as yet the home-coming pleasure seekers were not on their way from the theatres.
For half an hour the pair waited in the shadow, full of eager curiosity. The movements of the mystery-man of Hammersmith were, to say the least, suspicious.
Suddenly, from the basement a young footman appeared, and hurrying along to the end of the road, hailed a taxi and brought it to the door.
Then, as they watched, they saw, a few seconds later, the front door open, and a man in evening dress descended the steps and entered the taxi.
The light from the open door shone upon his face as he halted to speak to the servant, and then, to their amazement, they recognised the man to be Bernard Boyne.
His chameleon-like change staggered them both for a second, but Gerald, ever quick to act, whispered:
"Go home, Marigold. This is very funny. I'll try to follow," and a moment later he had sped away noiselessly into the darkness.
The fact was that his quick eyes had espied a taxi which at that moment had driven up on a stand a little farther down, and without delay he told the man that he wanted him to follow the taxi in front, and that he would give him treble fare for doing so.
"Right y'are, sir!" replied the young Cockney driver, who instantly entered into the spirit of the chase, and already his cab was on the move as Boyne left.
Gerald saw Marigold standing watching the departure, and knowing that she would make the best of her way to Wimbledon, kept his eyes upon the taxi, which was soon out into Knightsbridge, going in the direction of Hyde Park Corner.
Why Boyne, the humble collector of insurance premiums, should possess a latchkey to a house in Pont Street, and emerge from there dressed in evening clothes as a gentleman of means, sorely puzzled Gerald Durrant.
He felt instinctively that he was on the track of some very remarkable sequence of events. This man who disguised himself every night before he took food and drink up to his imprisoned friend, evidently lived a double life. In Pont Street he was a rich man, while in Hammersmith he was poor.
One point of satisfaction was that he was following the unsuspecting man, and would at least know his destination, even if that night he failed to discover the object of his visit.
That he was in a hurry was apparent. He seemed to have spoken excitedly to the young footman – who appeared to be a foreigner – before stepping into the taxi.
Up Park Lane they went, until suddenly the taxi conveying the man of mystery pulled up before a house in Upper Brook Street, while the vehicle in which Gerald had followed passed on for some distance before it stopped.
"'E's gone in that 'ouse, sir," said the taxi-man in a low voice.
"Yes, so I see. He may not be long. I'll wait," and he stepped out and strolled a little way in the opposite direction. Meanwhile Boyne had paid his man, who had turned his cab and left.
The house into which Boyne had disappeared was a block of flats, for as he passed he had caught a glimpse of the uniformed porter who had saluted him and followed him to the lift.
The mystery was thereby greatly increased, though many more startling circumstances were yet to be encountered.
Gerald Durrant idled there in the vicinity of the taxi, little dreaming into what a labyrinth of doubt and mystery he had now been drawn.
CHAPTER XI
SPREADING THE NET
Gerald Durrant remained outside the house in Upper Brook Street for more than half an hour. Much puzzled, he stood in a doorway opposite the block of flats into which Boyne had gone.
Marigold was on her way back to Wimbledon Park, and that night he intended to probe the mystery farther.
He waited, and still waited. A neighbouring clock struck the hours. The hall-porter at one o'clock closed the door and switched off the lights, yet Gerald still waited for the insurance agent of Hammersmith to emerge.
That he was known to the hall-porter was apparent, for the man had saluted him. It was strange, to say the least, that the man who was compelled to scrape for a living in Hammersmith should be guest in a fashionable flat in Upper Brook Street.
Bernard Boyne was certainly a man of mystery, for not only did he possess the latchkey of the smart house in Pont Street, but he was also known at that block of expensive flats.