The Aldens are helping the owner of a local restaurant grow delicious food in a garden. They work hard to water and weed and take care of the fruits and vegetables that are growing. But soon the children notice the strangest thing: the plants are moving. The tomato plants aren't in the same spot they were planted in! Then, when fruits and vegetables start to vanish from the garden, it's clear that a brand new mystery is sprouting for the Boxcar Children.