“That's what we look for,” Healy continued. “That's the weak point in bombs. Most detonators're triggered electrically. So, yeah, we cut the wires, and that's it. If somebody wants to get elaborate they could have a timed detonator and a rocker switch, so that even if you cut the timer, any movement will set off the bomb. Some have a shunt — a galvanometer hooked up to the circuit so that if you cut the wire the needle swings to zero because the current's been cut and that sets off the bomb. The most elaborate bomb I ever saw had a pressure switch. The whole thing was inside a sealed metal canister filled with pressurized air. We drilled a tiny hole to test for nitrate molecules — that's how bomb detectors at airports work. Sure enough, it was filled with explosives. There was a pressure switch inside. So if we'd open the canister the air would have escaped and set it off.”

“God, what did you do?”

"We brought it up here and were just going to detonate it but the word came from downtown they wanted to check the components for fingerprints. So we put it in a hyperbaric chamber, equalized the pressure inside and outside, opened it up and rendered it safe. It had two pounds of Semtex in it. With steel shot all around.

Like shrapnel. Purely antipersonnel. Mean, son-of-a-bitch bomb."

“You got the robot into the chamber?”

“Well, no. Actually I dismantled it.”

“You?”

He shrugged and nodded to the pit, where the two men had finished their wrapping exercise and were retreating to a bunker of concrete and sandbags.

“They're practicing setting off military charges. That's an MI 18 demolition block. About two pounds of C-4. For blowing bridges and buildings, trees. They've wrapped it with detonating cord and'll set it off by remote control.”

Over the loudspeaker came a voice: “Pit number one, fire in the hole! Fire in the hole!”

“What do they mean?” Rune asked.

“That's what they used to yell in coal mines when they lit the fuse on the dynamite. Demolition people use it now to mean there's about to be an explosion.”

Suddenly a huge orange flash filled the sky. Smoke appeared. And an instant later a clap of thunder slapped their ears.

“Boaters hate us,” Healy explained. “City gets a lot of claims for broken windows.”

Rune was laughing.

Healy looked at her. “What?”

She said, “It's just weird. You brought me all the way out here to give me a lesson on IEDs.”

“Not really,” he said, considering.

“Then why did you invite me?”

Healy looked away for a moment, cleared his throat. His face was ruddy to start with but it seemed he was blushing. He opened his attaché case and took out a couple of cans of diet Coke, two deli sandwiches, a bag of Fritos. “I guess it's a date.”

Death of a Blue Movie Star

CHAPTER TEN