Casey Falls (Nancy Allen) works as a runner at the Board of Trade for a ruthless commodities broker, Peter Oak (Dean Stockwell). It is her ambition to someday become a top trader herself, but Oak condescendingly insists that Casey will never make the grade.

Upset at the lack of opportunities for women, Casey is visited by a spirit, Nike (Danitra Vance), who angelically gives her tips that result in Casey making millions of dollars for traders like Marty Callahan (Brad Hall) and Chuck Feeney (Rance Howard). In love with her, Marty helps arrange it that Casey become a licensed trader. Before long, with Nike’s can’t-miss advice, Casey becomes one of the wealthiest women in the business.

Her attitude changes, however, when Nike abruptly goes from angel to devil and decides to coax Casey into monopolizing world markets and earning so much money that it will wreck the economy of others around the globe. Casey openly rebels, with the help of Marty and a street musician, Julius (Ray Charles), who is not what he seems.