The story of the three women General Ulysses S. Grant credited as helping the North win the Civil War.

The series reveals the extraordinary true story of the unsung women who helped turn the tide of the American Civil War in favor of the Union. At its center are a Virginia socialite, her indomitable mother, a formerly enslaved ally, and Richmond's most infamous courtesan—four women operating at the heart of Confederate power. Together, they evolve their Underground Railroad operation into a daring and highly effective espionage network, risking their lives and freedom to help preserve the nation's future and safeguard American Democracy.