Our heroine, Renata Wolfman (Wolfie) does everything by herself. Friends just get in the way, and she only has time for facts and reading. But friendship finds her in the form of Livingston Flott (Fly), the slightly weird and wordy boy from next door. Before she knows it, Wolfie is motoring through deep water with Fly as her second-in-command in a submarine made from a cardboard box. Out on a solo swim to retrieve a baseball vital to the mission, Wolfie is finally by herself again, but for the first time, she finds it a little lonely. Maybe there is something to this friend thing.