The Power of Vulnerability, by Brené Brown.

Given the amount of imposter syndrome, internalized shame, and unhealthy posturing that I've seen in the startup space, it seems especially relevant for folks here. This really changed my relationship towards vulnerability as a leader.

Also, it's quite entertaining. She's very charming in her delivery, and she does a good job exemplifying her findings in the presentation of the book.

It's actually an audio seminar, as opposed to a written book, but I think it's delivered far more effectively that way.