<p>In Greek mythology, Callisto was a nymph who survived being raped by Zeus only to be tortured and ultimately murdered by Zeus’s partner for her unchastity. Thousands of years later, Callisto’s story continues to reflect a persistent issue in society. Survivors of sexual assault still face punishment, not by vengeful gods, but by a justice system that silences, retraumatizes, and fails them. This failure is systemic: Over 75% of sexual assault survivors choose not to report their experiences due to institutional hostility, legal risk, and the absence of safe channels for action, leaving the bulk of sex crimes unaddressed. To change this, a solution must reduce the burden on survivors and rethink their path to justice. We examine how the nonprofit organization Callisto does just that by enabling a novel form of coordination: concealed flash organizing. Using a trauma-informed approach, Callisto allows survivors to store encrypted accounts of their assaults and fosters collective action. In doing so, Callisto replaces risky public disclosure with conditional, concealed coordination. This empowers survivors while minimizing harm and enables the formation of organizations that are too risky to emerge publicly but have the potential to improve the world. We argue that this approach not only redefines the conditions for organizing under threat but also offers a new pathway to justice in contexts where traditional systems have failed.</p>