Four brave siblings were searching for a home - and found a life of adventure! Join the Boxcar Children as they investigate some suspicious activity at a bus station in this illustrated chapter book series beloved by generations of readers.

The Boxcar Children take a bus trip to the Science and Hobby Fair, but a bad storm forces them to stay at a bus station along the way. Soon they are in the middle of a mystery involving a polluted river, two strange boys, and a suspicious bus-station manager.