Alphabet Murders. A chilling serial killer thriller, Paperback/Lars Schutz

FOR THIS KILLER, IT'S A GAME OF A B CCriminal profilers Jan Grall and Rabea Wyler are assigned the gruesome case of a man found murdered in a wildlife park. Then the killer strikes again and Grall and Wyler receive a mysterious package containing a blood-encrusted scrap of skin marked with a letter.