Harold only wants to help when he tries turning around a canoe tied to a dock. But he miscalculates, embarking on an adventure that introduces him to New England lake culture. With a boisterous frog as a companion, Harold engages with animals above and below the surface, encounters boaters, and learns some watercraft skills. He also learns to confront challenges, and to recognize limits. Teamwork, compromise, and human compassion combine to make Harold's lake trip an entertaining and educational drama.

Harold Leaps into Lake Winnie is set on New Hampshire's Lake Winnipesaukee, but the environment and the experiences depicted in the story relate to all New England lakes. While it delights and engages children, the book also promotes the qualities of responsibility, generosity and friendship. It warns against peer pressure and bad advice. Along the way, the story depicts animal habitats and animal relationships in the wild. While informing children, Harold Leaps into Lake Winnie captivates them with fast-moving, fun adventure.