A Monstrous Regiment of Women: A Puzzling Mystery for Mary Russell and Sherlock Holmes

While visiting London, Mary Russell comes across a friend from Oxford. The young woman introduces Mary to Margery Childe, charismatic leader of a religious sect involved in the suffrage movement.

When several members of the sect's female volunteers are murdered, Mary starts to investigate - but events spiral out of control, and Mary's search plunges her into the worst danger she has yet faced....