Merritt Fowler is a natural caretaker. Most of her life she has cared for her beautiful, erratic younger sister, Laura; her self-sacrificing physician husband, Pom; and her lovely, fragile sixteen-year-old daughter, Glynn. Now, in this strange summer of unnaturally warm weather and growing pressures, she is caring too for her husband's destructive, controlling mother, who is ill with advanced Alzheimer's disease. Exhausted and confused, Merritt no longer knows quite who she is or what is important to her.

She only knows that something deep inside is about to crack.

A fierce family quarrel sends Glynn running west from Atlanta to seek sanctuary with her aunt Laura, a fine actress whose promising Hollywood career is in decline. Merritt goes after her daughter - against Pom's wishes and in the face of his anger - and she impulsively decides to stay in California to see if the widening fissures between mother, sister, and daughter can be healed.

After a head-on collision with Laura's shallow, seductive Hollywood world and her betraying film director lover, the three women end up in Laura's red Mustang convertible, barreling up the wild coast from the Palm Springs Desert to the Santa Cruz Mountains outside San Francisco - earthquake country. In a borrowed lodge among the great redwoods, they finally stop to confront one another and their own demons.