"Tim, Max, Emily, Luke, and Nina, learn that their quiet town of Briny Deep isn't as safe as they once thought. With children vanishing, they need to find answers before all their friends disappear"--Provided by publisher.
When one of the lambs on the farm gets lost on the other side of the river, Daisy, who can communicate with animals, and her dog Boom help return him to the flock.
When children begin disappearing in the small town of Moonlight Bay, the police turn a blind eye and refuse to help look for the children, so Christopher Snow sets out to find them, and he discovers a secret that the entire police force will kill to keep quiet.
Pia, the last person to see ten-year-old Katharina Linden before she vanished, is determined to find out what happened, but her quest becomes complicated when a second child disappears.
After Little Pip the penguin gets lost she meets a whale, a kelp gull, and sled dogs who cannot help her, but with the aid of her family's song, home finds her.