"Impressive," Vicary said. "The second reason?"
"The second reason is that we became aware late in 1943 that we had not accounted for all the German spies operating in Britain. We learned about Kurt Vogel, we learned about his network, and we learned one of his agents was a woman. But we had a serious problem. Vogel had taken such care in burying his agents in Britain that we couldn't locate them unless we brought them into the open. Remember, Bodyguard was about to go into full gear. We were going to bombard the Germans with a blizzard of false intelligence. But we couldn't feel comfortable knowing there were live active agents operating in the country. All of them had to be accounted for. Otherwise, we could never be certain the Germans weren't receiving intelligence that contradicted Bodyguard."
"How did you know about Vogel's network?"
"We were told about it."
"By whom?"
Boothby walked a few paces in silence, contemplating the muddy toes of his Wellington boots. "We were told about the network by Wilhelm Canaris," he said finally.
"Canaris?"
"Through one of his emissaries, actually. In 1943, late summer. This probably will come as a shock to you, but Canaris was a leader of the Schwarze Kapelle. He wanted support from Menzies and the Intelligence Service to help him overthrow Hitler and end the war. In a gesture of goodwill, he told Menzies about the existence of Vogel's network. Menzies informed the Security Service, and together we concocted a scheme called Kettledrum."
"Hitler's chief spy, a traitor. Remarkable. And you knew all this, of course. You knew it the night I was assigned the case. That briefing on the invasion and deception plans. . . . It was designed to ensure my blind loyalty. To motivate me, to manipulate me."
"I'm afraid so, yes."
"So the operation had two goals: deceive them about Mulberry and at the same time draw Vogel's agents into the open so we could neutralize them."
"Yes," Boothby said. "And one other thing--give Canaris a coup to keep his head off the block until the invasion. The last thing we wanted was Schellenberg and Himmler in control. The Abwehr was totally paralyzed and manipulated. We knew that if Schellenberg took over he would question everything Canaris had done. We didn't succeed there, of course. Canaris was fired, and Schellenberg finally got hold of the Abwehr."
"So why didn't Double Cross and Bodyguard collapse with the fall of Canaris?"
"Oh, Schellenberg was more interested in consolidating his empire than running a new crop of agents into England. There was an impressive bureaucratic reorganization--offices moved, files changing hands, that sort of thing. Overseas, he threw out experienced intelligence officers loyal to Canaris and replaced them with unseasoned bloodhounds loyal to the SS and the party. In the meantime, the case officers at Abwehr headquarters went to great lengths to prove the agents operating inside Britain were genuine and productive. Quite simply, it was a matter of life and death for those case officers. If they admitted their agents were under British control, they would have been on the first train east. Or worse."
They walked in silence for a time while Vicary absorbed all he had been told. His head was spinning. He had a thousand questions. He feared Boothby might shut down at any time. He arranged them in order of importance, setting aside his seething emotions. A cloud passed in front of the sun, and it became cold.
"Did it all work?" Vicary asked.
"Yes, it worked brilliantly."
"What about the Lord Haw-Haw broadcast?" Vicary had heard it himself, sitting in the drawing room of Matilda's cottage, and it had sent a shiver through him. We know exactly what you intend to do with those concrete units. You think you are going to sink them on our coasts in the assault. Well, we're going to help you boys. . . .
"It sent panic through the Supreme Allied Command. At least on the surface," Boothby added smugly. "A very small group of officers knew of the Kettledrum deception and realized this was just the last act. Eisenhower cabled Washington and requested fifty picket ships to rescue the crews in case the Mulberries were sunk during the journey across the Channel. We made sure the Germans knew this. Tate, our double with a fictitious source inside SHAEF, transmitted a report of Eisenhower's request to his Abwehr controller. Several days later, the Japanese ambassador toured the coastal defenses and was briefed by Rundstedt. Rundstedt told him about the existence of the Mulberries and explained that an Abwehr agent had discovered they were antiaircraft gun towers. The ambassador cabled this information to his masters in Tokyo. That message, like all his other communications, was intercepted and decoded. At that moment, we knew Kettledrum had worked."
"Who ran the overall operation?"
"MI-Six, actually. They started it, they conceived it, and we let them run it."
"Who knew inside the department?"
"Myself, the DG, and Masterman from the Double Cross Committee."