I tapped the screen, trying to lock the routing path.

“It’s bouncing through a commercial relay in Boston, then heading back to the sound,” I said.

“Can we trace the physical transmitter?” Hayes asked.

“It’s within five hundred yards of this room,” I said. “On the base.”

“That means the operator is still here,” Carter said.

He looked at the heavy steel door of the server room.

“They have to be near the line of sight for the microwave link,” I said.

I looked up at the high window at the end of the corridor outside.

“The old water tower,” I said.

“The tower is decommissioned,” Turner said. “The ladder is locked.”

“Locks can be cut,” Hayes said.

He reached down to his tactical vest, checking his sidearm.

“Patterson, stay with the doctor,” Hayes said into his shoulder mic.

There was a double click of static in response.

“I’m going with you,” I said, picking up my tablet and checking the battery level.

“It’s a hot zone, Mitchell,” Hayes said.

“I’m the only one who can pull the decryption keys from the physical transmitter before they fry the drive,” I said.