When Hanna and her younger sister Zoe find a duckling with a broken leg in a nearby park, they are determined to nurse it back to health.
But after doing so, they realise that an even greater threat to the duckling has appeared: someone wants to develop the park into a shopping centre!
The duck becomes the rallying point for the girls and their neighbours, who stage a Lame Duck Protest. But will they succeed? Will the duckling's parkland home be preserved?
The book deals with issues of conservation and wildlife preservation in a touching way, and is accompanied by beautiful sketches and watercolour illustrations.