British and American anti-slavery societies were established in the 1820s and 1830s and from an early date included women campaigners. Typical of female abolitionists, the Weston sisters wrote, collected monies and signatures for petitions but rarely spoke in public or advocated a peculiarly feminist cause. This study uncovers their work in America, Britain and France, their connections and campaigns and their contribution both to the anti-slavery movement and to the forging of an Anglo-American democratic alliance.