A new title from the No.1 bestselling author, more than a million copies of her thrillers have now been sold to date worldwide. Martin Benner looks into the cold case of 'Sara Texas' - responsible for the brutal murder of five people in Texas and Sweden Kristina Ohlsson is a gritty and intriguing writer, and this new direction and protagonist deliver the start of a thrilling diptych that goes to the darkest depths of society.