Sweden's crime thriller duo serve up another spine-tingling, page-turning sensation with Stalker, the fifth novel in their Joona Linna series.The police receive a video clip of a woman in a window and reason that someone must have been standing in the garden just outside her house to be able to film her. The next day the woman is found dead in her home, the vicious violence of the scene shocks even the most seasoned investigators.   A few days later, another clip is sent anon