Anderson and Costello is a dark, atmospheric crime thriller series by Caro Ramsay, following the complex and often unsettling partnership between a troubled detective and his enigmatic handler. The books blend gritty realism with a subtle supernatural element, creating a tone of suspenseful unease and exploring the blurred lines between justice and corruption. It's distinguished by Ramsay’s evocative prose and intricately plotted investigations steeped in folklore and local legend.