[1] Anne Carson (Joan Taylor) is sent to a women's prison for allegedly participating in a bank robbery with two others, one, Paul Anderson (Lance Fuller) who is still at large.

On the outside, Paul is using blackmail and threats on Anne's ex-criminal father Pop Carson (Raymond Hatton) to find the money as well as offering to split it with him 50/50.

When a large earthquake hits the area and demolishes the installation, Jenny (who has acquired a pistol from her outside contacts and the outwardly harmless trustee Grandma Mae Marsh) and Melanee use the opportunity to escape with Anne to take her home to locate the money.

The downed telephone and power lines give the three girls time to escape unpursued, but Melanee is killed when Jenny and Anne take a stolen vehicle and leave her behind.

[4] Writing in All Movie, author and critic Hal Erickson described the film as "a typical babes-behind-bars affair, elevated by a better than usual cast," noting that "veteran thespians [...] make worthwhile contributions to the proceedings.