When Hannah and Scarlett meet Thomas in college - the chemistry is instantaneous. They grow closer while playing the Daring Game, where each dare is riskier than the last. As the trio grows closer and jealousy develops, Scarlett dares Thomas one final time - a dare that ends in tragedy. When Thomas gets expelled from school and leaves without a trace, it seems like the Daring Game has finally ended. Sixteen years later, Hannah is unhappy in marriage and in life. That is, of course, until she gets a mysterious email about the Daring Game from none other than Thomas himself. With Scarlett out of the picture, the sparks begin fly between them once more. When Hannah and Thomas are called back to the place where they first played the game, they are welcomed by a single dare - "to tell the truth." Someone else is playing the game and knows about their affair, going as far as leaving a cryptic message in Hannah's house: Don't You Dare. Hannah's list of suspects is long: Could it be her noisy neighbor, Libby, who has a few secrets of her own? Or did her husband plan this as revenge for the torrid affair? Is Scarlett back and ready to play again? The truth may set Hannah free - but only if she dares to risk everything she knows and loves.