Essie's twin brother Nate died when he fell off the railroad bridge. No one knows why he was up there, or how he fell. After Nate's old dog Apollo spots what looks like a ghost on their morning walk by the river, Essie wants to find out what really happened and why Nate isn't letting go. In the process, maybe she'll be able to stop her parents from blaming each other for Nate's death. To find clues, Essie quits the Camera Club and walks on to the...