In this story-based STEM kit, Pepper Mint visits her aunt who is a scientist researching primates. She lives in a treehouse in the rainforest on the island of Borneo. The treehouse is not connected to the electrical power grid, but Pepper Mint and her aunt devise mechanical inventions to accomplish various tasks. They equip the treehouse with mechanical equipment using pulleys, winches, and gears, and learn lessons in physics. Projects include a rope ladder, a pulley to lift heavy objects into the treehouse, a rubber-band-powered lift, a rotating palm leaf umbrella, a zipline, a catapult, and a trap door.