Rage Against the Dying by Becky Masterman

After a long and murky career with the FBI, Brigid Quinn is trying to move on. She's got a nice house. Dogs. A husband who knows nothing of her past. But the abduction and murder of a young female colleague still haunts her. So when the girl's body is finally found, and a man confesses to the murder, Brigid is desperate for answers. Yet the more she learns, the more convinced she is that they have the wrong man. Following leads that the Bureau ignored, she's propelled straight into the path of a ruthless serial killer. One who has evaded the law for decades, and will stop at nothing to keep her quiet... But Brigid Quinn is a woman to be reckoned with.

The Snowman by Jo Nesbo

THE FIRST SNOW WILL COME. A young boy wakes to find his mother missing. Their house is empty but outside in the garden he sees his mother's favourite scarf - wrapped around the neck of a snowman. AND THEN HE WILL APPEAR AGAIN. As Harry Hole and his team begin their investigation they discover that an alarming number of wives and mothers have gone missing over the years. AND WHEN THE SNOW IS GONE... When a second woman disappears it seems that Harry's worst suspicions are confirmed: for the first time in his career Harry finds himself confronted with a serial killer operating on his home turf. ...HE WILL HAVE TAKEN SOMEONE ELSE.