When Joan Watson meets Sherlock Holmes the enigmatic, private detective, she can't help but be intrigued by her endless deductions. Holmes, also enticed by Watson's mask of normality, sees an opportunity. But things aren't what they seem. As Sherlock battles with not only her dark past and her burning but unrealistic desire for a friend a new player emerges from the shadows. Both women are thrust into a dangerous battle of wits with an elusive killer. The game is on and Joan has to decide: is Holmes really worth risking the only life she knows?