"Today, women are ascendant in standup comedy, even preeminent. They make headlines, fill arenas, spawn blockbuster movies. But before Amy Schumer slayed, Tiffany Haddish killed, and Ali Wong drew roars, the very idea of a female comedian seemed, to most of America, like a punchline. And it took a special sort of woman-indeed, a parade of them-to break and remake the mold. In on the Joke is the story of a group of unforgettable women who knocked down...

In the mid-1970s, Jay Leno, David Letterman, Andy Kaufman, Richard Lewis, Robin Williams, Elayne Boosler, Tom Dreesen, and several hundred other shameless showoffs and incorrigible cutups from across the country migrated en masse to Los Angeles, the new home of Johnny Carson's Tonight Show. There, in a late-night world of sex, drugs, dreams and laughter, they created an artistic community unlike any before or since. It was Comedy Camelot--but it couldn't...