School's out for summer and teacher Bas announces a triathlon for the youth in Polderstad will be held. The following days the candidates are busy training.
Dolf is coaching Hannes and to improve the results he demands Pikkies help.
Alfred gets teased by Dolf because he is being raised by a mole. At school the teacher tells about the history of Polderstad in the Middle Ages. After school Alfred and Dolf start a fight. Then Alfred discovers the big secret of Dolf.
Alfred becomes an orphan and Henk decides to raise him as Alfred's foster parent.
One year later Alfred celebrates his first birthday. During a tour through the royal castle Pikkie the magpie brings Alfred's future in danger.
With help of his best friend Henk the Mole Johan Sebastiaan Kwak meets Anna van de Polder.
Soon they have a nest, which appears difficult to protect. Meanwhile others have their plans for Great Waterland.
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