Annie Walker

She may be new to the government's most secretive branch, but 28-year-old Annie Walker (Piper Perabo) has the uncanny instincts, tenacity and persistence that could make this girl-next-door a lethal weapon. Although her first mission unexpectedly ends in a hail of bullets, Annie doesn't get flustered or second-guess her new career path when the Agency unexpectedly promotes her to field operative. If anything, it has made her more determined to be good at her job and see her assignments through.

In the blink of an eye, an assignment can go from routine to rogue and when Annie finds herself in situations with no rules or prior training to guide her, all she can rely on is her intuition. Too bad her intuition didn't keep Annie from getting her heart broken by someone she believed was the man of her dreams ... but that was two years ago. Now the CIA and its inherent dangers are a welcome change -- almost a kind of refuge.

As Annie plunges headlong into her new job, she soon realizes it means having to lead a double life, whether it's lying to her family or facing down ruthless terrorists around the world and enemies of the state. Unlike her older sister Danielle who has worked hard to build a stable, reliable, and predictable life, Annie likes the peripatetic and unpredictable nature of working for the Agency. But she'll soon find out that staying emotionally unattached could prove to be far more challenging than staying alive.