DS Amelie Davis is utterly devoted to her husband, Edward. Having suffered in silence through years of abuse at the hands of her father, she thought she would never trust another man. Then Edward came along and proved her wrong.
But in the middle of the night, Amelie receives a phone call from an unknown number. The voice at the other end asks: Do you really think you know your husband?
Struggling to separate her past trauma from a case at work in which three teenage girls have been found murdered, and watching her husband's every move with increasing paranoia, Amelia grapples with the fear that her husband is not the man she thought she knew at all. In fact, he might just be the man she's been hunting...
But what do you do when the man you love might be a killer? Turn him in? Or help him hide...