The body of a young woman had apparently lain in her apartment for weeks when it was discovered, prompting Stuttgart detectives Thorsten Lannert and Sebastian Bootz to begin their investigation. Why hadn't anyone missed Nelly Schlüter? Neither her parents nor her brother, and certainly not her best friend, Fine Slowinski? Everyone described Nelly as outgoing and cheerful, but none of them were interested in getting closer to her. Thorsten Lannert and Sebastian Bootz wondered whether Nelly Schlüter was really as lonely as she seemed and searched for the person Nelly would have been better off not letting into her life.