And sure enough, Lefevre managed a final ace, falling to his knees, fists clenched in triumph. It was a pose seen hundreds of times before on the courts of Wimbledon and the audience duly rose to its feet, applauding. But it hadn’t been a good match. Blitz should have won. Certainly the game shouldn’t have ended in three straight sets. He had been terribly off form and the young Frenchman had walked all over him.

Alex collected the last of the balls and sent them rolling up to the far corner. He stood to attention while the players shook hands, first with each other, then with the umpire. Blitz walked towards him and started packing up his sports bag. Alex studied his face. The German looked dazed, as if he couldn’t quite believe he had lost. Then he picked up his things and walked away. He gave one last salute to the audience and walked off the court. Lefevre was still signing autographs for the front row. Blitz had already been forgotten.

“It was a really bad game,” Alex said. “I don’t know what was wrong with Blitz. He seemed to be sleepwalking half the time.”

It was an hour later and Alex was sitting at a table in the Complex, the set of rooms underneath the umpire’s office at the corner of Number One Court where the two hundred boys and girls who work throughout the tournament have their meals, get changed and relax. He was having a drink with two other ballboys and a ballgirl. He had become good friends with the girl in the last couple of weeks-so much so that she’d invited him to join her and her family when they went down to Cornwall after Wimbledon finished. She was dark-haired, with bright blue eyes and freckles. She was also a fast runner and very fit. She went to a convent school in Wimbledon and her father was a journalist working in business and current affairs, but there was nothing remotely serious about her. She loved jokes, the ruder the better, and Alex was sure that her laughter could be heard as far away as Court Nineteen. Her name was Sabina Pleasure.

“It’s too bad,” Sabina said. “But I like Lefevre. He’s cute. And he’s only a bit older than me.”

“Seven years,” Alex reminded her.

“That’s nothing these days. Anyway, I’ll be back on Centre Court tomorrow. It’s going to be hard to keep my eye on the game.”

Alex smiled. He really liked Sabina, even if she did seem to have a fixation with older men. He was glad now that he had accepted Crawley ’s offer. “Just make sure you keep your hands on the right balls,” he said.

“Rider!” The voice cut through the general chat in the cafeteria and a small, tough-looking man came striding out of a side office. This was Wally Walfor, the ex-RAF sergeant responsible for the ballboys and girls.

“Yes, sir?” Alex had spent four weeks training with Walfor and he had decided that the man was less of a monster than he pretended to be.

“I need someone for standby. Do you mind?”

“No, sir. That’s fine.” Alex drained his drink and stood up. He was glad that Sabina looked sorry to see him go.

Standby involved waiting outside the umpire’s office in case he was needed on one of the courts or anywhere inside the grounds. In fact, Alex would enjoy sitting outside in the sun, watching the crowds. He took his tray back to the counter and was about to leave when he noticed something that made him stop and think.

There was a security guard talking on a public telephone in the corner of the room. There was nothing strange about that. There were always guards posted on the entrance to the Complex and they occasionally slipped down for a glass of water, or perhaps to use the toilet. The guard was talking quickly and excitedly, his eyes shining, as if he was passing on important news. It was impossible to hear what he was saying in the general hubbub of the cafeteria, but even so Alex sidled a little closer in the hope of picking up a few words. And that was when he noticed the tattoo. With so many ballboys and girls in the room and with the cooks busy behind the counter, the temperature had risen. The guard had taken off his jacket. He was wearing a short-sleeved shirt. And there, on his arm, just where the material ended, was a large red circle. Alex had never seen anything quite like it. A plain, undecorated circle with no writing, no sign of a picture. What could it mean?

The guard suddenly turned and saw Alex looking at him. It had happened very quickly and Alex was annoyed with himself for not taking more care. The guard didn’t stop talking but he shifted his body so that the arm with the tattoo was away from Alex’s view. At the same time, he covered the tattoo with his free hand. Alex smiled at him and gestured, as if he was waiting for the phone. The guard muttered a few more words and hung up. Then he put his jacket back on and moved away. Alex waited until he had gone back upstairs, then followed him. The guard had disappeared. Alex took his place on the bench outside the umpire’s office and considered.

A telephone conversation in a crowded cafeteria. It shouldn’t have meant anything. But the strange thing was, Alex had seen the guard a short while before, about an hour before the Blitz/Lefevre game had begun. Alex had been sent over to the Millennium Building to deliver a racquet to one of the other competitors and had been directed to the players’ lounge. Climbing the staircase that swept up from the main reception, he had found himself in a large, open area with television monitors on one side and computer terminals on the other, and bright red and blue sofas in between. He knew he was privileged to be there. This was a private place. Venus Williams was sitting on one of the sofas. Tim Henman was watching a game on TV. And there was Jamie Blitz himself, getting a plastic cup of iced mineral water from the dispenser against the far wall.

The guard had also been there. Alex had noticed him standing rather awkwardly near the stairs. He was watching Blitz, but at the same time he was using a mobile phone. At least, that was what it looked like. But Alex had thought at the time that there was something strange about him. Although the mobile was at his ear, he wasn’t actually talking. All his attention was on Blitz. Alex had watched as Blitz drank his water and walked away. The guard had walked off a few seconds later.

What had he been doing inside the Millennium building? That was the first question Alex asked himself now as he sat in the sunshine, listening to the thwack of distant tennis balls and the applause of an unseen crowd. And there was something else, more puzzling. If the guard had a mobile phone, and if that phone had been working just a few hours ago, why had he needed to make a call from the public telephone in the corner of the Complex? Of course, his battery could have gone down. But even so, why use that particular phone? There were telephones all over the club, up on the surface. Could it be that he didn’t want to be seen? And why did he have a red circle tattooed on his arm? He hadn’t wanted that to be seen. Alex was certain he had tried to cover it up. And there was something else. Maybe it was just coincidence, but the guard, just like the man who had broken into the All England Tennis Club to begin with, was Chinese.