"Sarah Cole and her sister Lacey are at it once again when they learn their missing parents' cell phone has been traced to Alden, Michigan.
When the FBI declines to continue the investigation, Sarah takes matters into her own hands. She calls upon the Super Spies and they delve into the situation. Suddenly, the teens find themselves immersed in small town intrigue and mystery involving a menacing stranger, who Sarah dubs "The Stalker." But when Sarah learns he's connected to her parents' disappearance, she's determined to find out what that connection is."