Sixteen-year-old Anna Lewis has been abducted from her home by a suspected killer, and she's running out of time.
A serial murderer known for stalking and kidnapping teenage girls is on the loose in Texas, and the FBI is struggling to find a lead. That is, until Special Agent Cassie Murray, fresh out of the academy, returns to Dallas to begin her career.
On day one, a series of mysterious phone calls and an invitation to play a game of Twenty Questions draws Cassie into the center of the high-stakes case. And in order to catch the killer, she'll have to come face-to-face with the horrors of her past.
Twenty questions. Twenty days.
Will Cassie be able to piece together the clues in time to save Anna Lewis? Only time will tell.