When their favorite author fails to arrive as scheduled to speak at the local library, the Alden children investigate how he could board a train and never be seen again.
The famous mystery writer, Gilbert Finch, is coming to Greenfield to speak at the library, and the Aldens can't wait to meet him. When they go with Grandfather to pick Finch up at the train station, he is nowhere to be found. Henry, Jessie, Violet, and Benny need to solve this mystery quickly. Otherwise, Finch's archrival, Daniel VanBuren, will speak at the library instead of Finch!