Blood Line — Andrew H. Vachss

For those too afraid or intimidated by technology to think about where their kids go on the Internet, Andrew Vachss' Blood Line will rock you to your core.

In the world of dangerous men, a blood line is a cause passed from generation to generation from master to protégé. But on the path to becoming a master, each protégé must find their own hunting ground…

When a young girl is lured away by an Internet predator, the young protégé of an assassin who never leaves a trace decides to leave his own mark by hunting down sexual predators targeting vulnerable teens who are bullied and feeling unwanted.

As Sonny discovers his own cause -- his own reason for existence -- and a skill set beyond anything his master taught him, he steps out of the shadows and joins a long blood line of masters seeking justice on behalf of defenseless children.