Written by Kate Hannigan
Published by Little, Brown Books for Young Readers, 2016
2019-2020 Nominee - Intermediate
When orphaned eleven-year-old Nell Warne arrives in Chicago, she is shocked to find that her long-lost aunt is a detective working for the famous Pinkerton's National Detective agency! 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, and Nell quickly makes herself indispensable by cracking codes, wearing disguises, and spying on nefarious criminals. But can she also solve the case of what really happened on the night her best friend disappeared?