“A full frontal waterborne assault is out of the question,” he said.

“Can't say I'm disappointed. I haven't forgotten our shoot out in Alaska,” Zavala said.

“I had hoped to see down into the water. In the old days the lake was as clear as crystal, but the runoff from all the development around the shores has clouded up the water with algae growth.”

Zavala had been studying another photo. After their strategy meeting at NUMA headquarters, Austin called up a NOAA satellite photo of Lake Tahoe. The shot showed the water temperature of the lake in colors. The lake was almost entirely blue except for one spot along the western shore where the red shade denoted high temperatures. The heated water was practically under the Gogstad pier. It was similar to the heat pulse in the ocean off the Baja coast.

“Pictures don't lie,” Zavala said “There's always the possibility of a hot spring.”

Austin frowned.

“Okay, say you're right, that there's an underwater facility like the one in the Baja. There's one thing I don't understand. We're talking about a desalting plant. This is a freshwater lake.”

“I agree, it doesn't make sense. But there's only one way to find out for sure. Let's head back and see if our package has arrived.”

Austin started the engine and pointed the winch boat toward South Lake Tahoe. They skimmed over the intense blue waters, and before long they were pulling into a marina. A lanky figure stood at the end of a finger pier waving at them. Paul had stayed on shore. His wound was still too tender to allow him to bounce around in a boat. As they pulled up to the slip he grabbed the line with his good hand and tied them off.

“Your package has arrived,” he announced. “It's in the parking lot.”

“That was fast,” Austin said. “Let's take a look.” He and Zavala set off toward the parking lot.

“Wait,” Paul said.

Austin was eager to check out the delivery. “We'll fill you in later,” he said over his shoulder.

Paul shook his head. “Can't say I didn't try to warn you,” he muttered.

The flatbed truck was pulled up off to the side. The object on the trailer was about the shape and size of two cars, one behind the other. It was covered with padding and dark plastic. Austin had moved in for a closer look when the passenger door of the truck opened and a familiar figure stepped out. Jim Contos, skipper of the Sea Robin, strolled over with a grin on his face.

“Uh-oh,” Zavala said.

“Jim,” Austin said. “What a nice surprise.”

“What the hell is going on, Kurt?” The grin had vanished.

“It was an emergency, Jim.”

“Yeah, I figured it was an emergency when Rudi Gunn called in the middle of sea trials and told me to ship the SeaBus out to Tahoe ASAP. So I just tagged along on the ride in from San Diego to see who was on the receiving end.”