The twin brothers Hielke and Sietse get involved in a major disaster that is attacking their village, followed by two thieves who they must help to catch a valuable piece of gold.

Hielke and Sietse Klinkhamer reunite with their old friend Louw Vrolijk when he and his mother come to visit Lenten. Later, Mother Nature strikes at the heart of Friesland when an earthquake makes the ground go vibrate and Hielke and Sietse have to rescue their father Heit and friend Gerben who got trapped in the forge on fire. When a golden nugget appears above the soil in the aftermath, criminal brain Jantje Bril wants to steal it and forces Hielke and Sietse to drive their Kameleon as the getaway boat.—Arjen Rooseboom