But everything had suddenly slowed to a crawl. This was a nightmare.

In fact, Hala realized, the line had completely stopped.

A couple of uniformed TSA agents were unhooking the stanchion belt up ahead, motioning for two people to step out of line. It was another couple — also Saudi, also in Western dress.

“Sir? Ma’am? Could you come with us, please?”

“What for?” the other man asked, immediately on the defensive. “We haven’t done anything wrong. Why should we lose our rightful place in the queue?”

His accent was Najdi, Hala noticed. The same as theirs.

But who were these people? Could this just be a coincidence? One look at Tariq’s worried face and she knew he was wrestling with the same questions. Was their American mission about to be compromised before it had even begun?

More American security personnel hurried over now. A husky black female officer took the Saudi woman firmly by the arm.

“Farouk!” the woman screamed for her husband. Then she yelled at the security police. “Leave us alone! Take your dirty hands off me!”

As Hala watched the husband, her heart skipped. He was reaching for something in his pocket. One of the guards tried to pull his arm away. But the man pushed back hard. The guard went down on his ass.

Two more officers rushed forward. There was a violent scuffle. The police threw the Saudi man to the floor. Jumped on his back. But he fought and got one hand free. The next moment, he’d stuffed something into his mouth.

And that’s when Hala knew — this was no coincidence. She had a potassium cyanide capsule in her pocket as well. So did Tariq.

Whatever this couple had done to tip off the authorities, there was nothing the Al Dossaris could do for them now. Their only obligation at this point was to avoid detection. Above all, they mustn’t be captured, too.

And they wouldn’t be. Not if they kept their heads, Hala knew. Service to the cause was everything. Their mission could change the world. But first, they had to make it out of here alive. The Family was depending on them. Their mission here meant everything.

Tariq grasped her hand tighter. His own hand was wet with sweat. “I love you, Hala,” he whispered. “I love you so much!”

“THIS GUY JUST ate some thing!” one of the TSA officers shouted to his partners. He held down the struggling, writhing husband while another guard tried to force the man’s mouth open.

Hala saw the stream of blood run down over his chin. That meant he’d bitten through the capsule’s rubber coating, into the glass bead inside. Her heart was thundering now. As a doctor, she knew all too well about the effects of potassium cyanide on the body. It was going to be horrible, absolutely awful to witness. Especially with a capsule right there in her own pocket.

Almost immediately, the man began to convulse. His torso bucked slowly, his legs kicking back and forth. It was an instinctive but ultimately useless response. While the oxygen built up to dangerous levels in his blood, less and less of it would reach his vital organs, including the lungs. The panic alone would be excruciating. The terrible burning inside.