Many Jews use the term "Bad Jew" as a weapon against other members of the community or even against themselves, a condemnation for those who don't keep kosher, only go to temple on Yom Kippur, marry outside the faith, or enjoy Christmas music. What does it mean, and who decides? Drawing on 150 interviews, Emily Tamkin looks for answers as she tracks the evolution of Jewishness throughout American history, and explores many of the evolving and conflicting Jewish positions on Israel, assimilation, race, finance, politics, and social justice.