When Eisenberg answered the call, Duncan told him of the tip from Antwerp and the suspicion that Falkenstein was involved. He explained that the Falkensteins had left Manhattan that afternoon and had headed north.
“Keep a check on the hotels, Abe,” Duncan said. “They may be headed your way to pick up the diamonds.”
“Remember, I’m up here all alone,” Eisenberg said. “I can’t do my job and watch them too.”
Duncan laughed. “Don’t worry. You’ll get reinforcements. I’ll send Harold Smith up on the next plane. Julius Zamosky and I will come up by car. We may need the car to tail them when they start back this way.”
Duncan called Smith and told him to get to Montreal by plane as quickly as possible to give Eisenberg a helping hand. Then he called Zamosky, another of the veterans on the Racket Squad, and at dawn they were headed out of Manhattan for the Canadian border.
All day Saturday and Saturday night the agents, working with Canadian police, kept Falkenstein and his wife under surveillance. Falkenstein made several telephone calls to friends and visited them in their offices. Then at 9 A.M. on Sunday, he and his wife checked out of the hotel. They stowed their luggage in the car trunk and headed south.
Duncan, Smith and Zamosky followed the Falkenstein car out of Montreal. When it was evident the couple intended to cross the border at Champlain, New York, Duncan radioed a request to the Champlain Customs station asking that the Falkensteins be detained.
Julius and Ann Falkenstein were seated in an inspector’s office when Duncan and his aides walked in and closed the door.
Falkenstein came out of his chair with a display of outraged innocence. “What is the meaning of this?” he shouted. “Why are we being held here?”
Duncan said, “We happen to think you went to Montreal to pick up a shipment of diamonds.”