Wolfie and Fly - Cary Fagan

Wolfie and Fly is an early chapter book at its simplest and best. 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.