Zeta colony seems like the perfect place to settle and raise a family. The air is clean, and magnificent forests cover the planet. Its only city has a friendly, small-town atmosphere and a strong economy, thanks to the export of super tree lumber to Earth and other lumber-starved planets.

But when houses mysteriously start collapsing, killing the unsuspecting families inside, scientist Ed Ralston begins to suspect that the genetically engineered super trees may somehow be responsible. It's up to Dr. Ralston and his daughter Lindy to find out how and why before more people die and the colony turns into a ghost town.