After a series of small tremors in Los Angeles, Dr. Clare Winslow, a local seismologist, pinpoints the exact location and time of when the long awaited earthquake--"The Big One"--will strike southern California. With this information, she must battle city officials to release this information to the general public. Also, she hopes that her family is out of harms way when the quake strikes. Subplots show how other families and people cope with the the tremors that strike before the impending "Big One."

The tables turn for cynical police officer Richard Beck when he's viciously attacked by two homicidal crooks. Having never been empathetic toward the victims he's dealt with on a daily basis, Beck must now confront the tough system he was a part of. As he struggles to regain his status at work, he also must make sure those responsible for his attack are prosecuted.

A man and a woman go out on a "big" third date. He's ashamed to admit he just lost his job, and she's afraid he'll run away if he finds out that she has a kid. Small lies lead to bigger ones and the night gets crazy very soon.