At the tender age of 16, Lexie Murphy learns the hard way that it sucks life doesn't come with trigger warnings. The mystery-addicted insomniac is an unapologetic snoop. She's always eavesdropping and spying on neighbors while she aspires to a life somewhere between two of her literary idols: Nancy Drew and Stephanie Plum. Her amateur sleuthing takes a dark turn over Fourth of July weekend when she witnesses a gruesome act being committed in the neighbor's recently vacated house.

She alerts the local police department, expecting appreciation for her investigative initiative. Instead, the local police make their disapproval very clear by scolding her and shutting her out of the investigation. Apparently, the real world is no place for amateur sleuths.

Incensed and thirsty for true justice, Lexie takes her crusade to the internet and shares what the police can't or won't in her anonymous Nosy Girl blog. She researches relentlessly and posts her findings in the hope that truth and justice will win the day. Will she take her fixation on justice too far? Can she make a real difference as a keyboard crusader?