It's not likely that you're going to be discussing state secrets at home.
But if you've got a computer in your bedroom, put black electrical tape over the webcam.
There are plenty of people — not just the NSA or FBI, but also creeps, criminals, teachers and creditors — who will use your webcam, and also your computer's microphone, to spy on you.
In 2010, two high school students near Philadelphia sued their local school district because school personnel had activated the anti-theft software on their school-issued Mac Books and secretly photographed the students at home.
He tries to save the next targets and eventually tries to trace the killer.