The storm came without warning.

One moment, Manhattan stood beneath a hazy, steel-grey sky; the next, a torrential downpour lashed against the glass towers like some vengeful reckoning. The rain distorted the skyline into a smudged watercolor, hiding the outlines of the world Emma Hayes had spent years conquering.

She stood alone in her new office at the top of the Hartmann Global Tower—sleek, modern, everything she had once dreamed of. But today, it felt like a cage made of glass and ...