The Mystery of the Secret Message

The Aldens are helping their grandfather organize Greenfield's winter festival. When the Boxcar Children get a roll of photos developed, they find a secret message hidden in one of them. They are baffled, and things become even more mysterious when they realize that someone is trying to ruin the Winter Festival by tearing down the ecorations and stealing a local statue! There must be a connection between the festival and the secret message... But what could it be?