Last seen / Anna Smith.

Life has changed for Private Investigator Billie Carlson. After years of chasing down every lead possible, she's finally found her son, Lucas, and brought him safely home to Glasgow. One afternoon, Billie gets a call from an unknown number. The man on the end of the phone refuses to tell her his name, but he explains that his brother, Omar, is being held in prison after stabbing two men outside a block of flats. He wants Billie to investigate what happened that night and find out any information that might help Omar. Reluctantly, Billie takes on the case. But as she starts to untangle what happened that night, she can't shake the feeling that she's being watched. With Lucas depending on her, Billie is determined to avoid any dangerous encounters. But trouble seems to have a way of tracking her down.