The lack of closure in an unsolved case seems to have a sharpening effect on those left behind; the details remain vivid to them even years later, possibly because they've gone over them looking for answers so many times.
I delve into cold cases by scouring the Internet for any digital crumbs authorities may have overlooked, then share my theories with the 8,000 or so mystery buffs who visit my blog regularly.
When my family goes to sleep, I start clicking, combing through digitized phone books, school yearbooks, and Google Earth views of crime scenes: a bottomless pit of potential leads for the laptop investigator who now exists in the virtual world.
