Gabriel stared down at the lights of London and waited for the phone to ring. Fifteen minutes later, he heard a thin, tinny version of the Adhan, the Muslim call to prayer. He silenced it with a press of a button and raised the phone to his ear. It took them only thirty seconds to deliver the next set of instructions. Gabriel dropped the phone into the rubbish bin next to the bench, then took hold of the duffel bags and started walking.

At the makeshift command center inside the Israeli embassy, Uzi Navot laid down the handset of his secure radio and snatched up the receiver of his telephone. He quickly dialed a number for Thames House, the riverfront headquarters of MI5, and ten seconds later heard the voice of Graham Seymour.

“Where is he now?” Seymour asked.

“Heading across Hampstead Heath toward Highgate. They just told him that if he has a radio or a weapon on him at the next stop, Elizabeth Halton will be executed immediately. In a few seconds he’s going to be off the air.”

“What can we do for you?”

“Trace a telephone.”

“Give me everything you have on it.”

Navot gave Seymour the model and telephone number.

“I don’t suppose they were foolish enough to leave any information in the calling history.”

“The phone was clean, Graham.”

“We’ll run it and see if we come up with anything. But I wouldn’t hold out much hope. Unfortunately, there is no shortage of jihadists in our local telecommunications industry. They’re damned clever when it comes to covering their tracks with phones.”

“Just give us anything you come up with.”

Navot slammed down the phone and picked up the radio handset again. He grunted a few words in terse Hebrew, then looked at Shamron. He was pacing the room slowly, leaning heavily on his cane.

“You’re wasting your time chasing that phone, Uzi. You should be chasing the watchers instead.”

“I know, boss. But where are the watchers?”

Shamron stopped in front of a computer monitor and peered at a grainy night-vision image of four young men playing football outside the padlocked Hampstead Heath running track.

“At least one of them is right there in front of you, Uzi.”

“We’ve had them under watch since before Gabriel arrived. No phone calls. No text messaging. Only football.”

“Then you should assume that’s what the Sphinx told him to do,” Shamron said. “That’s the way I would have done it—an old-school, physical signal. If Gabriel is clean, keep playing football. If Gabriel is being followed, have an argument of some sort. If Gabriel has a radio, take a cigarette break.” Shamron poked at the screen. “Like that boy is doing right there.”

“You think one of them is a spotter?”

“I’d bet my life on it, Uzi.”