In 30 years in the banking industry, she ascended to a level of power and wealth that few women have known. Her rise tells an unlikely story of what it takes to succeed as an interloper in the Wall Street boys’ club. Her fall is a murkier tale about how executives are coping with the growing public scrutiny and skepticism about what exactly banks are doing with all our money. Five years ago, would anyone have cared about a large trading loss incurred by a strong, well-capitalized bank? When the business press, including this paper, first started digging into the debacle, it seemed possible that Dimon himself could go down. He didn’t, of course, but the conversation reflects how precarious power in banking has become. Nobody understands that better now than Ina Drew. But who exactly was she? She has declined to speak to the media, and various investigations are continuing that will reveal a more complete picture of the story. But interviews with dozens of friends and former colleagues over the last three months begin to fill in the picture of a woman whose career traced a period of dramatic change on Wall Street.