His portion of the loot from a recent heist squandered, minor-league criminal Frank Harper talks his boss, Flood, into a more lucrative project: on the weekend before a Monday payday, break into a San Felipe, California bank, which will be holding a million-dollar payroll for the Marine Base at Camp Pendleton South, California. Flood plans the operation, sending his moll Kay with Frank to become established in the community at San Felipe and to lay the groundwork for the heist.