Caught by Harlan Coben was published in 2010.
Harlan Coben - Caught book description:
Reporter Wendy Tynes is making a name for herself, bringing down sexual offenders on nationally-televised sting operations.
But when social worker Dan Mercer walks into her trap, and is tied to the disappearance of a seventeen-year-old New Jersey girl, the shocking consequences will have Wendy doubting her instincts about the motives of the people around her.