Rosa and Esther march through downtown Detroit in August 1968 to protest the war in Vietnam. When a bloodied teenager reports that mounted police are beating protestors a few blocks away, the young women hurry to offer assistance. They try to stop the violence, but an officer is injured and the sisters are arrested. Rosa sees an opportunity to protest the war in court. Esther has an infant daughter and wants to avoid prison, which means accepting a plea bargain and testifying against her sister. Told from multiple points of view and through the sisters’ never-mailed letters, Her Sister’s Tattoo explores the thorny intersection of family loyalty and clashing political decisions