Trouble and Her Friends — Melissa Scott

Less than a hundred years from now, the forces of law and order crack down on the world of the computer nets. The hip, noir adventurers who get by on wit, bravado, and drugs, and haunt the virtual worlds of the Shadows of cyberspace, are up against the encroachments of civilization. It's time to adapt or die.

India Carless, alias Trouble, got out ahead of the feds and settled down to run a small network for an artist's co-op.

Now someone has taken her name and begun to use it for criminal hacking. So Trouble returns. Once the fastest gun on the electronic frontier, she had tried to retire-but has been called out for one last fight. And it's a killer.