Zack Quack and his brothers take the train to New York City where Zack gets lost, and the three brothers are joined by increasing numbers of city folks trying to find him.
In Australia, fourteen-year-old Kip becomes a suspect after he finds the backpack of a twelve-year-old girl who was seemingly swept away during a storm while playing hide-and-seek with her sister on the coast.
Lost in the woods of Rathburn Park, eleven-year-old Matthew weighs the odds of dying from thirst, embarrassment, or at the hands of the forest's reputed ghostly inhabitants.
Henry, a mouse who lives in a lighthouse, seeks help from a puffin and other animal friends to find the mother of a very hungry baby seal who was separated from her during a storm.
Paul, who lives in a trailer, and Sebastian, who lives in an apartment, are discouraged from playing with each other, until they get lost together during a class outing.