More than 15 million children currently go online - more than 10 million of then in America. Are they safe? For that matter, are adults safe when they go online? Maybe not. 48 Hours takes a look at cyberstalking and other online dangers. Tracking Cyber-Predators: Correspondent Peter Van Sant reports on Operation Blue Ridge Thunder, a team of investigators in rural Virginia trying to crack down on pedophiles who comb the Web to find victims. Catching A 'Traveler': Van Sant continues his report: After months of work, Operation Blue Ridge Thunder moves to arrest one alleged pedophile. Will it succeed? Love's Tangled Web: Bill Lagattuta explores a new way to check on people you meet online. One woman relied on the service, with some unexpected results. An Online Tragedy: Susan Spencer reports on one man who took his obsession into cyberspace, with deadly results.