11 Best Mystery and Thriller Books of April 2021

April’s crop of must-read mystery and thrillers are all about giving you major chills. From the next installment in Caroline Kepnes’s supremely creepy You series to a horror-thriller about the Satanic panic of the ’80s, the 11 new releases on this list are all definitely sleep with the lights on material. Trust us, thriller fans, you’re in for a treat this month if you love your mysteries with a side of horror, sci-fi, or apocalyptic dread. Ready to dive into April’s twisty batch of fresh releases? Read on for our picks for the best thriller and mystery reads coming your way this month — and if you’re more of a cozy mystery fan then don’t forget to check out last month’s selections, too!