When Nate Twitchell discovers that one of his family's hens has laid the biggest egg he has ever seen, he is determined to see it hatch. And when it does, neither he nor his parents, the townspeople, the scientists, or the politicians from Washington are prepared for what comes out!
Nate, a 12-year-old boy living in New Hampshire, takes over the care of an enormous egg laid by one of the family's hens, and the last thing he expects to hatch from it is a triceratops!