Cassia Spohn and Katharine Tellis assess the criminal justice system’s response to sexual assault, exploring the complex dynamics that shape the actions of police and prosecutors. The authors draw on unparalleled access to Los Angeles detectives, prosecutors, and case files to make sense of the factors that affect the outcomes of sexual assault claims. Following cases from victim report, to police investigation, to the decision to charge—or not to charge—they provide new insights into why shockingly few sexual assault claims lead to an eventual criminal conviction.