Daybreak

Published independently and later collected in Security Breach.
"Nora Brooks and Randall Goodwin are hot on the trail of a new cyber-terrorist. This time the target is Seattle as well as the lucrative cruise ships docked there. All indications are that daybreak will bring unprecedented destruction.
Who was nursing a vendetta against the largest city in the Pacific Northwest as well as the tourist industry? Nora Brooks has dealt with many different kinds of cyber criminals, but she's never come across one whose motive and method she couldn't grasp at all."