 Kezia doesn t believe in paying property taxes, and it isn t long before Mrs. Olesen decides to foreclose on the property and purchase it for herself as the family s vacation home. Nels objects to the purchase, knowing she had acquired it unfairly and that Kezia would have no place to go, but Mrs. Olesen responds by moving herself and Nellie and Willie to the lakeside property. Mrs. Olesen, in a show of pity, hires Kezia to be their servant and force her to live in the shack. Laura, Albert and Andy watch from afar and are disgusted at how cruelly the three Olesens are treating their friend Kezia, and also aware that Mrs. Olesen used underhanded means to buy the property. One night, after hearing Caroline read a story about monsters, Albert comes up with an idea to concoct a monster to drive the Olesens off the property. Working with Kezia, the children set their plans in motion, but Mrs. Olesen, Nellie and Willie are too smart for any tricks and harden their resolve to stay on "their" property. Eventually, Laura, Andy and Albert bring out the heavy artillery: creating a Loch Ness monster out of paper maché. When they hatch their plans, Mrs. Olesen and her children are convinced that the (non-existant) monster poses a real threat to their safety and they beat it. Nels celebrates the success of Laura s plan with Kezia and the others, and it isn t long before Kezia s ownership in her property is restored ... with the promise she will pay her property taxes, no matter what she thinks.