Kirsty Wilson can't believe her luck when she lands a room in a luxury Glasgow flat owned by Eva Magnusson, a wealthy fellow student from Stockholm. But delight turns to terror when Kirsty finds the Swedish girl dead in their home and their male flatmate accused of her murder. Kirsty refuses to accept that he is guilty and, inspired by family friend Detective Superintendent Lorimer, sets out to clear his name. Meanwhile, Lorimer calls on his trusted colleague, psychologist Solly Brightman, to help unravel the truth behind the enigmatic Eva. But it is not long until another woman, bearing a marked resemblance to Eva, is brutally murdered in Glasgow. Is it possible that Glasgow's finest detective has put the wrong man behind bars?