The death of a ninety-year-old woman with a heart condition should not be suspicious. Detective Sergeant Harbinder Kaur certainly sees nothing out of the ordinary when Peggy’s caretaker, Natalka, begins to recount Peggy Smith’s passing.

But Natalka had a reason to be at the police station: while clearing out Peggy’s flat, she noticed an unusual number of crime novels, all dedicated to Peggy. And each psychological thriller included a mysterious postscript: PS: for PS. When a gunman breaks into the flat to steal a book and its author is found dead shortly thereafter—Detective Kaur begins to think that perhaps there is no such thing as an unsuspicious death after all.