Music is her life.15 songs decide how long it lasts.A month ago, fifteen-year-old Feline Jagow disappeared, presumed abducted, on her way to school. Her distraught mother asks private investigator Alexander Zorbach, a former police detective, to discover her whereabouts.Despite a month having elapsed since her disappearance, Feline's music playlist was changed just a few days ago. Could a seemingly innocuous list of songs contain a hidden clue to where the girl is being held - and how she can be rescued - or is the truth something more sinister?Zorbach needs Alina Grigoriev's help, but enlisting the medium will prove difficult given their shared past. The mystery of the playlist plunges Zorbach into a horrifying nightmare, in which the chances of survival for everyone involved are close to zero.