No one knew them. No one knew where they had come from.

A super-special mystery for the Boxcar Children!

Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather, and they are visiting Broken Moon Pond, where Grandfather vacationed as a child.

The children are enchanted by the wilderness and happy to meet another family with four children staying at the pond. But the Aldens soon encounter a strange set of coincidences and mishaps that threaten to spoil everyone's fun. When one night they see a rowboat moving across the water with no one in it, they begin to wonder: Is the pond haunted, as the townspeople claim? The Boxcar Children are determined to discover who -- or what -- is trying to scare everyone away!