sudden ripple of wind disturbing a field of wheat. The message from the gorilla was so subtle, Bourne was the only one who picked up on it. He registered movement at the extreme edge of his peripheral vision, tracked for several seconds. He leaned back to Specter, said in a low, urgent voice. "Leave now. Go straight through the Small Mammal House, then turn left. A hundred yards on will be a small food kiosk. Ask for help getting to your car. Go back to your house and stay there until you hear from me."
As the professor walked swiftly away, Bourne grabbed Tarkanian, pushed him in the opposite direction. They joined a Home Sweet Habitat scavenger hunt comprising a score of rowdy kids and their parents. The two men Bourne was tracking hurried toward them. It was this pair and their rushed anxiety that had aroused the suspicion of the silverback, alerting Bourne.
"Where are we going?" Tarkanian said. "Why did you leave the professor unprotected?"
A good question. Bourne's decision had been instantaneous, instinct-driven. The men headed toward Tarkanian, not the professor. Now, as the group moved down Olmsted Walk, Bourne dragged Tarkanian into the Reptile Discovery Center. The lights were low here. They hurried past glass cases that held dozing alligators, slit-eyed crocodiles, lumbering tortoises, evil-looking vipers, and pebble-skinned lizards of all sizes, shapes, and dispositions. Up ahead, Bourne could see the snake cases. At one of them, a handler opened a door, prepared to set out a feast of rodents for the green tree pythons, which, in their hunger, had emerged from their stupor, slithering along the case's fake tree branches. These snakes used infrared heat sensors to target their prey.
Behind them, the two men wove their way through the crowd of children. They were swarthy but otherwise unremarkable in feature. They had their hands plunged into the pockets of their wool overcoats, surely gripping some form of weapon. They weren't hurrying now. There was no point in alarming the visitors.
Passing the European glass lizard, Bourne hauled Tarkanian into the snake section. It was at that moment that Tarkanian chose to make a move. Twisting away as he lunged back toward the approaching men, he dragged Bourne for a step, until Bourne struck him a dizzying blow to the side of the head.
A workman knelt with his toolbox in front of an empty case. He was fiddling with the ventilation grille at the base. Bourne swiped a short length of stiff wire from the box.
"The cavalry's not going to save you today," Bourne said as he dragged Tarkanian toward a door set flush in the wall between cases that led to the work area hidden from the public. One of the pursuers was closing in when Bourne jimmied the lock with the bit of wire. He opened the door, stepped through. He slammed it shut behind him, set the lock.
The door began to shudder on its hinges as the men pounded on it. Bourne found himself in a narrow utility corridor, lit by long fluorescent tubes, that ran behind the cases. Doors and, in the cases of the venomous snakes, feeding windows appeared at regular intervals along the right-hand wall.
Bourne heard a soft phutt! and the lock popped out of the door. The men were armed with small-caliber handguns fitted with suppressors. He pushed the stumbling Tarkanian ahead of him as one of the men stepped through. Where was the other one? Bourne thought he knew, and he turned his attention to the far end of the corridor, where any moment now he expected the second man to appear.
Tarkanian, sensing Bourne's momentary shift of attention, spun, slamming the side of his body into Bourne's. Thrown off balance, Bourne skidded through the open doorway into the tree python case. With a harsh bark of laughter, Tarkanian rushed on.
A herpetologist in the case to check on the python was already protesting Bourne's appearance. Bourne ignored him, reached up, unwound one of the hungry pythons from the branch nearest him. As the snake, sensing his heat, wrapped itself around his outstretched arm, Bourne turned and burst out into the corridor just in time to drive a fist into the gunman's solar plexus. When the man doubled over, Bourne slid his arm out of the python's coils, wrapped its body around the gunman's chest. Seeing the python, the man screamed. It began to tighten its coils around him.
Bourne snatched the handgun with its suppressor from his hand, took off after Tarkanian. The gun