Liz McAdams is haunted by the memories of a tornado that destroyed her home 25 years ago. Now a professional storm tracker, she and her family are in danger once again as another devastating twister rapidly gains momentum. Caught in the path of destruction, Liz and her estranged husband struggle to save those they love...

A tale told over four seasons, starting in autumn when Juno, a 16-year-old high-school junior in Minnesota, discovers she's pregnant after one event in a chair with her best friend, Bleeker. In the waiting room of an abortion clinic, the quirky and whip-sharp Juno decides to give birth and to place the child with an adoptive couple. She finds one in the PennySaver personals, contacts them, tells her dad and step-mother, and carries on with school. The chosen parents, upscale yuppies (one of whom is cool and laid back, the other meticulous and uptight), meet Juno, sign papers, and the year unfolds. Will Juno's plan work, can she improvise, and what about Bleeker?