As a kid, Charlotte Illes' uncanny sleuthing abilities made her a minor celebrity. But eventually she hung up her detective's hat and stashed away the signature blue landline in her "office"-aka garage-convinced that finding her adult purpose would be as easy as tracking down missing dessert or locating stolen diamonds. Now 25, Charlotte has a nagging fear that she hit her peak in adolescence. She's living with her mom, scrolling through job listings, and her love life consists mostly of first dates. When it comes to knowing what to do next, Charlotte hasn't got a clue. And then, her old blue phone rings... Reluctantly, Charlotte is pulled back into the mystery-solving world she knew-just one more time. But that world is a whole lot more complicated for an adult. As a kid, she was able to crack the case and still get her homework done on time. Now she's dealing with dead bodies, missing persons, and villains who actually see her as a viable threat. And the detective skills she was once so eager to never use again are the only things that can stop a killer ready to make sure her next retirement is permanent.