When a powerful tornado destroys the Dawson family's home, they move into a house-on-wheels called Astrid. Built by David Dawson, a clever engineer, Astrid is powered by the latest high-tech computers and can do all kinds of amazing things including being able to talk. Elena and Alex, who are five and seven, travel across the country in their new home as their parents take them somewhere else to live. The family faces many problems on the way and Astrid is very strong and safe, but will it be enough to protect them from every danger?