Eleven-year-old Nell Warne couldn't have imagined what awaits her when she arrives on her long-lost aunts doorstep lugging a heavy sack of sorrows. Much to Nell's surprise, her aunt is a detective, working for the world-famous Pinkerton's National Detective Agency! Nell quickly makes herself indispensable to Aunt Kate..and not just by helping out with household chores. As her aunt travels around the country solving mysteries. Nell must crack codes, wear disguises, and spy on nefarious criminals. With nation-changing events simmering in the background as Abraham Lincoln heads for the White House, Aunt Kate is working on the biggest case of her life. But Nell is quietly working on a case of her own: the mystery of what really happened the night her best friend left town. Based on the extraordinary true story of America's first female detective, Kate Warne, The Detectives Assistant is full of feats of daring and danger, bold action, and newfound courage.