“They can’t. But they do have limits.”

“What exactly are those limits?” asked Chapman.

“Typical scent radius for the dogs is about three feet in all directions aboveground. And they can sniff out explosives buried up to roughly the same distance belowground.” Garchik pointed at the crater. “This hole before the bomb went off was over four feet deep and well over eight feet across.”

“But uncovered,” Stone pointed out.

“Yeah, but the root ball was huge. Six feet wide by over three feet high.”

Stone realized something. “And there was yellow warning tape up cordoning off this area. So the dogs might not have gotten within ten feet of it.”

“That’s

right,” said Garchik. “So whether the bomb was here when they made their pass or not, chances are good they wouldn’t have detected it unless their handlers took them past the tape and let them climb right on top of the root ball. Which I sort of doubt was the case.”

Stone’s gaze immediately swung toward the White House. “Then we need to talk to the people who installed it as soon as possible. But first we need to look at the video.”

“Video?” said Chapman.

“The video feed will show when that tree went in and who did it. It will also show if anyone went back in there afterward. And what they had with them. Like a bag big enough to place a basketball in.”

Garchik said, “It would be pretty hard to slip a basketball inside a root ball and not have someone see you. There’s a burlap sack around it to hold the dirt and roots together, but it would still be complicated. You’d have to get the ball there somehow, get down into the hole, slit the sack, put the ball in and somehow patch the sack back up.”

Chapman added, “And he couldn’t exactly waltz it past the White House guards. I’m assuming the workers have to go through checkpoints.”

“Yes, they do,” answered Stone. “And I would imagine an X-ray of the basketball would reveal the bomb inside?”

“Absolutely,” said Garchik.

“Then if one of the groundspeople was involved he didn’t take the ball through White House security.” He looked around. “But he could have come directly to the park to begin work on the tree. Someone could have given him the ball then. The White House wouldn’t be involved at all.”

“Which would be captured on the video,” said Garchik. “We’ll have to check that angle, but it seems way too easy to detect on our part.”

Stone said, “Which means we’re missing something.” He looked down at the crater. “Let’s check that video feed. Right now.”

CHAPTER 27

A FEW MINUTES LATER they were standing in the FBI’s command post on Jackson Place. They had called in two Secret Service agents, who huddled with them around the large TV screen. The feed they would be looking at had come from the Secret Service’s archives.

“We keep the images for a minimum of fifteen years,” explained one of the Secret Service agents.

“You’re not the only agency with electronic eyes on the park, though,” said Stone.

The same agent smiled. “We all have peepers on our little slice of Hell’s Corner. In an ideal world we all share what we see, but this is far from an ideal world.”

“What exactly are you looking for?” asked the other agent.

Stone explained about the tree being planted, and also about the bomb dog going near the tree.

Agent Garchik had stayed behind in the park to keep going over the crime scene, but Tom Gross had joined them after being called by Stone. The FBI agent said, “We need to see the entire feed from the time the tree was delivered to the moment the bomb went off.”

They were shown this feed from three different angles. It took a long time, even though the security guard was able to speed up the frames without any significant detail being missed. At the end they stared at the screen with the same unanswered questions.

Gross said, “The dogs did make a pass, but they stayed outside the tape line. That was a big hole in the security wall. Secret Service is going to get dinged for that.”

The two agents exchanged glances and grimaced but said nothing.

“And there wasn’t even a hint of anyone planting anything in that hole,” added Chapman.

Stone said, “You’re sure this is all the footage?”

One of the agents said, “That’s it.”

Gross, Stone and Chapman left the command center. On the way back to the park Gross said, “I can’t remember the last case I had where not only haven’t I taken a step forward, I keep taking steps back.”

Stone closed his eyes and recalled what he had seen on the video. A crane had lifted the large tree up into the air. Then a crew of National Park Service personnel in their green-and-khaki uniforms had moved in and helped direct the placement of the maple into the hole.

He opened his eyes. “There had to be a staging area for the tree. Where it was kept before being installed? That wasn’t on the video.”

“That’s right,” said a hopeful-looking Gross.

Chapman added, “And the time stamp on the video shows that the tree was put in a day before the bombing happened. So why was the hole still uncovered?”

“You don’t sound American,” said Carmen curiously.

“I’m not.”

Carmen looked confused. Stone said, “Can we come in?”

They followed her down a short hall to a tiny room. The furniture was thirdhand, the floor littered with junk. Stone could smell rotting food.

“I haven’t had a chance to clean up lately,” Carmen said, but her tone was unapologetic. She dropped onto the couch and stood her braces against the arm of the furniture. On either side of her was stacked what Stone could only politely describe as crap.