When Grandfather's friend Mrs. Winkles needs some extra workers at her candy factory, the Boxcar Children are thrilled to help. What could be more fun than spending their days making candy? But working in the factory isn't as sweet as they expected. Workers are quitting, machinery is breaking down, and mysterious threatening messages are appearing on the candy hearts. It looks like someone is sabotaging Mrs. Winkles's candy!

Gertrude Chandler Warner was born in 1890 in Putnam, Connecticut, where she taught school and wrote The Boxcar Children because she had often imagined how delightful it would be to live in a caboose or freight car. Encouraged by the book's success, she went on to write eighteen more stories about the Alden children.