The Overlook

was an urban legend, that there’s never actually been a dirty bomb.”
    “The official designation is IED-improvised explosive device. And put it this way, it’s only an urban legend until precisely the moment that the first one is detonated.”
    Bosch nodded and got back on track. He gestured to the house in front of them.
    “How did you know this isn’t the Kent house?”
    Walling rubbed her forehead as though she were tired of his annoying questions and had a headache.
    “Because I have been to his house before. Okay? Early last year my partner and I came to Kent ’s house and briefed him and his wife on the potential dangers of his profession. We did a security check on their home and told them to take precautions. We had been asked to do it by the Department of Homeland Security. Okay?”
    “Yeah, okay. And was that routine for the Tactical Intelligence Unit and the Department of Homeland Security, or was that because there had been a threat to him?”
    “Not a threat specifically aimed at him, no. Look, we’re wasting-”
    “Then to who? A threat to who?”
    Walling adjusted her position in the seat and let her breath out in exasperation.
    “There wasn’t a threat to anyone specifically. We were simply taking precautions. Sixteen months ago someone entered a cancer clinic in Greensboro, North Carolina, circumvented elaborate security measures and removed twenty-two small tubes of a radioisotope called cesium one-thirty-seven. The legitimate medical use of this material in that setting was in the treatment of gynecological cancer. We don’t know who got in there or why, but the material was taken. When news of the theft went out on the wire somebody in the Joint Terrorism Task Force here in L.A. thought it would be a good idea to assess the security of these materials in local hospitals and to warn those who have access to and handle the stuff to take precautions and to be alert. Can we
please
go now?”
    “And that was you.”
    “
Yes
. You got it. It was the federal trickle-down theory at work. It fell to me and my partner to go out and talk to people like Stanley Kent. We met him and his wife at their house so we could do a security check of the place at the same time we told him that he should start watching his back. That is the same reason I was the one who got the call when his name came up on the flag.”
    Bosch dropped the transmission into reverse and pulled quickly out of the driveway.
    “Why didn’t you just tell me this up front?”
    In the street the car jerked forward as Bosch threw it into drive.
    “Because nobody got killed in Greensboro,” Walling said defiantly. “This whole thing could be something different. I was told to approach with caution and discretion. I’m sorry I lied to you.”
    “A little late for that, Rachel. Did your people get the cesium back in Greensboro?”
    She didn’t answer.
    “Did you?”
    “No, not yet. The word is that it was sold on the black market. The material itself is quite valuable on a monetary basis, even if used in the proper medical context. That’s why we are not sure what we’ve got here. That’s why I was sent.”
    In ten more seconds they were at the correct block of Arrowhead Drive and Bosch started looking at address numbers again. But Walling directed him.
    “That one up on the left, I think. With the black shutters. It’s hard to tell in the dark.”
    Bosch pulled in and chunked the transmission into park before the car had stopped. He jumped out and headed to the front door. The house was dark. Not even the light over the door was lit. But as Bosch approached the front door he saw that it had been left ajar.
    “It’s open,” he said.
    Bosch and Walling drew their weapons. Bosch placed his hand on the door and slowly pushed it open. With guns up they entered the dark and quiet house and Bosch quickly swept the wall with his hand until he found a light switch.
    The lights came on, revealing a living room that was neat but empty, with no sign of trouble.
    “Mrs. Kent?” Walling called out loudly. Then to Bosch in a lower voice she said, “There’s just his wife, no children.”
    Walling called out once more but the house remained silent. There was a hallway to the right and Bosch moved toward it. He found another light switch and illuminated a passageway with four closed doors and an alcove.
    The alcove was a home office that was empty. He saw a blue reflection on the window that was cast by a computer screen.