The little old lady behaving badly a novel

Nothing can stop The Senior League. They have a plan and it's going to need money. Lots of money. Perhaps a bank robbery could finance their endeavour? That would likely bring in ten million, but that wouldn't be enough for what they have in mind . . . So Martha and her friends set out to catch the biggest financial fish in the sea - venture capitalists. In their hunt for the big bucks, the gang plan to cheat billionaires out of their luxury yac...