Grace King Bichon, who is managing her father's riding-stable, discovers that her husband Eddie is deceiving her with another woman. After confronting him in the middle of the night on the streets of their small home town, she decides to stay at her sister Emma Rae's house for a while to make up her mind. Breaking out of her everyday life, she starts to question the authority of everyone.

In the early 21st century, mankind has colonized the oceans. The United Earth Oceans Organization enlists Captain Nathan Bridger and the submarine seaQuest DSV to keep the peace and explore the last frontier on Earth.