After many years in jail, Cassie Black wants to put an end to her criminal life and live a normal one. However, she needs a final blow that will allow her last dream to come true and then turn her life around. For this, she seeks help from Leo Renfro, an old friend who offers her to take part with him in a great robbery in Las Vegas. In spite of the danger, she accepts convinced that nothing will go wrong. Superstitiously, Leo advises her to not carry out the plan during a new moon for it can spoil the most perfect plan.