What should you do if you discover you're dead and didn't know it? Murder detective, Kate Madding, does as she always has when something emotionally challenging comes along - she throws herself into work. That's why she is known as D.I. Ghost. A serial killer is at large and she joins forces with his victims to bring him to justice. Suffering from posthumous traumatic stress when they first meet, their friendship slowly gives meaning to their afterlife, as Kate also helps her twin sister, Carrie, come to terms with her death. This is the antidote to the usual serial killer detective story. The ghostly victims are feisty, funny and out for revenge.