Christine Boskoff was a mountaineer who pushed boundaries and set records.

She climbed mountains no North American woman had ever summited, and she was the only American woman to have reached the top of six of the world's 8,000-meter peaks. She was also a well-respected guide.

But despite her impressive resume, Chris's story went largely untold — until this year.

This spring, writer Johanna Garton published a book called Edge of the Map, chronicling Chris's rise in the mountaineering world. Johanna joins us to talk about how Chris got her start, the challenges she faced as a woman in a man's realm, and the complicated moral questions surrounding her death on a sacred mountain.