Journey on a Runaway Train by Gertrude Chandler Warner (The Boxcar Children #1, New, 2017, Pbk, 138 pages, Scholastic)

Henry, Jessie, Violet, and Benny didn't think the old trunk in their house held anything interesting. But an unusual statue they find inside leads them to the Reddimus Society, a secret guild dedicated to returning lost treasures to where they belong.

Now the Aldens must help their new friends by traveling across the country with the statue and six mysterious boxes! Can the Boxcar Children keep these seven treasures out of the wrong hands?