Let the plot begin with the chiefs of Micr0s0ft, G00gle, fb, and top bankers assemble on a luxury yatch with their hot secretaries... Let the ship be taken to south pole by your hot women in black... Those guys can gift you 500 million wwithout a blink... But this time, they choose not to. The us govt steps in... Your girls go into special hot action... Even after 2 decades, those guys will still be rulers and not too old...
Nice idea: This one gets into the scenario: ransom. So I would create some major havoc in a multi billion dollar company and than ask a ransom to stop it. Problem: How do I cash in the ransom? If I would ask for cash, I would get a truckload of marked bills. If I would ask for a wire, it could be traced back. Unless I could come up with a scenario how to withdraw 500 mln in a couple of hours.
You see, not so easy to come up with the perfect crime