Book Riot s Mystery Deals of the Day for September 27 2021 - 29Book Riot s Mystery Deals of the Day for September 27 2021 - 63Book Riot s Mystery Deals of the Day for September 27 2021 - 46Book Riot s Mystery Deals of the Day for September 27 2021 - 77Book Riot s Mystery Deals of the Day for September 27 2021 - 50