A cold case in Amsterdam Central

Detective Lotte Meerman is convinced the death of Frank Stapel, a painter and decorator, isn't an accident after she and his widow Tessa find a skeleton in a sports bag in his left luggage locker at Amsterdam Central train station. The remains date from the Second World War and Lotte's colleagues consider it of minor importance ... until forensic tests show that amongst the bones is the arm bone of a crime boss who recently went missing.