Rosina is frustrated by her engagement to millionaire John Johnson III, a fussy, domineering, control freak. The night before her wedding, she goes out dancing with her maid María, María's husband Tomás, and their friend Gordillo. When Rosina learns Gordillo is a sailor on the yacht owned by Mexican film star José María Beltrán, she decides to stow away and sail to Mexico to be with her grandmother.

Maya is a quick-witted young woman who comes over the Mexican border without papers and makes her way to the LA home of her older sister Rosa. Rosa gets Maya a job as a janitor: a non-union janitorial service has the contract, the foul-mouthed supervisor can fire workers on a whim, and the service-workers' union has assigned organizer Sam Shapiro to bring its "justice for janitors" campaign to the building. Sam finds Maya a willing listener, she's also attracted to him. Rosa resists, she has an ailing husband to consider. The workers try for public support; management intimidates workers to divide and conquer. Rosa and Maya as well as workers and management may be set to collide.