The adventure continues! Squirrel Knuspel has to escape from the oak park because one morning the excavators roll up there and start cutting down the trees. Together with Horse and Wool, he tries to stop the builders. But at first they don't stand a chance against Hubert Hämmerlein, the nasty boss of the construction site. When Finchen then discovers a secret construction plan, the friends learn that Hämmerlein wants to produce flowers in his factory. But can this really be true? Wool and Horse are determined to find out what the secret of the flower factory is all about.