Dubbed "Citizen Tipster" by police, Brad Willman, spent night after night writing a Trojan Horse program that gave him complete control over every computer that downloaded it.

Alone and in the dark, he sat for up to 16 hours a day monitoring hundreds of targets, secretly reading their e-mail and tracking their every step online.

He started keeping files on the targeted users. He tracked them for almost three years --recording everything. The majority of his targets were ordinary people -- but some in the files included priests, social workers, soldiers, police officers and justice officials.

He catalogued each file by degree of risk and focused on suspected child-porn producers and molesters.

This was his life. He had no friends in school and skipped the prom. Even these days, his only entertainment away from the computer is going to the odd movie, alone.

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