Not sure this is the untold story as much as it is a collection of anecdotes from a variety of sources, but I did find it interesting, if a bit scattered.

There’s coverage of Page, Brin, and Schmidt of course. But there are stories about Andy Rubin and Android, Steve Jobs, Nikola Tesla (a big influence on Larry Page), Paul Buchheit and gmail, Marissa Meyer, and a lot more.

Definitely an enjoyable read.