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 cross-country team her brother was expected to lead to victory this year. She's never competed before, but she and Nate ran together all their lives. When her teammates freeze her out, Essie thinks they know more about Nate's death than they're saying. Essie picks up her camera again. Can she find the truth with her lens? Sometimes it feels like Apollo is the only one with any answers.