Residents of the city of Petroville are suffering through the hottest and driest summer on record. Desperate for a way to cool off, Luz and her friends head out to Spring Pond to go swimming. But when they arrive, they're shocked to discover that the pond has virtually disappeared! As it turns out, a multinational company has purchased the nearby land and is using the water to make their soda. Meanwhile, the community vegetable gardens in Friendship Park are withering -- at risk of dying because of the lack of rain -- and the city has imposed water restrictions. Luz and her friends are just kids, but is there anything they can do to help save two of Luz's favorite places?