I’m Desperately Looking For Creepy Books About Unsolved Disappearances/Mysteries

I'm someone who generally loves reading fictional horrors and thrillers but now I really want to read about true life cases of bizarre/unsettling disappearances and unsolved mysteries I want quality books that really delve into cases and where you can tell decent research has been done. The creepier the better. Thank you 😊 by TellTaleTrix